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American Institute of Physics |
Documentos disponibles de esta editorial (326)
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Wide classes of explicit solutions of the Manin-Radul and Jacobian supersymmetric KP hierarchies are constructed by using line bundles over complex supercurves based on the Riemann sphere. Their construction extends several ideas of the standard[...]![]()
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Gómez-Ullate Otaiza, David ; Grandati, Yves ; Milson, Robert | American Institute of Physics | 2014-04Considering successive extensions of primary translationally shape invariant potentials, we enlarge the Krein-Adler theorem to mixed chains of state adding and state-deleting Darboux-Backlund transformations. It allows us to establish novel bi-l[...]![]()
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Domínguez-Adame Acosta, Francisco ; Sánchez, A. ; Díez, E. | American Institute of Physics | 1997-01-15We study the quantum dynamics of electronic wave packets in quantum-well based semiconductor superlattices subject to an applied electric field. Using a high-accuracy numerical method, we analyze the dynamical behavior of electronic wave packets[...]![]()
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Crespo del Arco, Patricia ; Hernando Grande, Antonio ; Garcia Escorial, A. ; Kemner, K.M. ; Harris, V. J. | American Institute of Physics | 1994-11-15The local structure and chemistry of a ferromagnetic fcc-Fe_50Cu_50 solid solution obtained through high-energy ball milling were measured before and after heat-treatment-induced decomposition using extended x-ray-absorption fine-structure measu[...]![]()
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Ruiz de Elvira, Jacobo ; Garcia Martin, R. ; Kami?ski, Robert ; Peláez Sagredo, José Ramón | American Institute of Physics | 2011We show how the new precise data on kaon decays together with forward dispersion relations, sum rules and once- and twice-subtracted Roy equations allow for a precise analysis of ? ? scattering. The once subtracted Roy equations provide a more [...]![]()
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We study the strange and non-strange quark mass dependence of the parameters of the f_0(600), ?(800), ?(770) and K*(892) resonances generated from elastic meson-meson scattering using unitarized one-loop Chiral Perturbation Theory. We fit simult[...]![]()
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Nogales Díaz, Emilio ; Martin, R. V. ; O'Donnell, K. P. ; Lorenz, K. ; Alves, E. ; Ruffenach, S. ; Briot, O. | American Institute of Physics | 2006-01-16The structural properties of nanometric AlN caps, grown on GaN to prevent dissociation during high temperature annealing after Eu implantation, have been characterized by scanning electron microscopy and electron probe microanalysis. The caps pr[...]![]()
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Piqueras de Noriega, Javier ; Alemán Llorente, Belén ; Ortega Villafuerte, Yanicet ; García Martínez, José Ángel | American Institute of Physics | 2011-07-01Fe dopedZnO nanowires,nanorods, and urchin-like nanostructures have been grown using an evaporation-deposition method with compacted mixtures of ZnS and Fe_2O_3 powders, with different Fe contents as precursors. Treatments at 950 °C under argon [...]![]()
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Martínez Matos, Óscar ; Hernández Garay, María de la Paz ; Izquierdo, J. G. ; Vaveliuk, Pablo ; Bañares Morcillo, Luis ; Calvo Padilla, María Luisa | American Institute of Physics | 2014-07-28A procedure to characterize the induced damage and the incubation effects in volume transmission gratings under femtosecond laser pulse train illumination is presented. It was also developed a formalism that explains the damage processes. Our pr[...]![]()
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Dhar, S. ; Kammermeier, T. ; Ney, A. ; Pérez García, Lucas ; Ploog, K. H. ; Melnikov, A. ; Wieck, A. D. | American Institute of Physics | 2006-08-07The structural and the magnetic properties of Gd-focused ion-beam-implanted GaN layers are studied. Gd^(3+) ions were uniformly implanted in molecular beam epitaxy rown GaN layers at room temperature with an energy of 300 keV at doses ranging f[...]![]()
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Quesada, A. ; García, M. A. ; Andrés, M. ; Hernando Grande, Antonio ; Fernandez, J. F. ; Caballero, A. C. ; Martín González, M. S. ; Briones, F. | American Institute of Physics | 2006-12The origin of ferromagnetism in diluted magnetic semiconductors is still an open question, yielding a great deal of research across the world. This work focuses on the Co-Zn-O system. Room-temperature ferromagnetism is observed after a partial r[...]![]()
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Fernández Pérez, Luis Antonio ; Martín Mayor, Víctor ; Verrocchio, P. | American Institute of Physics | 2006We report clear finite size effects in the specific heat and in the relaxation times of a model glass former at temperatures considerably smaller than the Mode Coupling transition. A crucial ingredient to reach this result is a new Monte Carlo a[...]![]()
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Fernández Pérez, Luis Antonio ; Gordillo Guerrero, A. ; Martín Mayor, Víctor ; Ruiz Lorenzo, J. J. | American Institute of Physics | 2008We present a detailed numerical study on the effects of adding quenched impurities to a three dimensional system which in the pure case undergoes a strong first order phase transition (specifically, the ferromagnetic/paramagnetic transition of t[...]![]()
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A deep analysis of the current-voltage (I-V) characteristics of YBa2Cu3O7 grain boundary Josephson junctions (GBJJs) allows us to go much farther than the usual calculus of the transport parameters. It is possible to construct a structural image[...]![]()
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Ruiz Gómez, Sandra ; Serrano, A. ; Carabias,, I. ; Garc?a, M. A. ; Hernando Grande, Antonio ; Mascaraque Susunaga, Arantzazu ; Pérez García, Lucas ; González Barrio, Miguel Ángel ; Rodríguez de la Fuente, Óscar | American Institute of Physics | 2017-02-27We have used a low-energy ion bombardment to fabricate an epitaxial single-crystalline magnetite/hematite bilayer grown on Au(111). This non-conventional fabrication method involves the transformation of the upper layers of a single-crystalline [...]![]()
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Llanes Estrada, Felipe José ; Cotanch, Steve ; General, Ignacio ; Wang, Ping | American Institute of Physics | 2008The Franck-Condon principle governing molecular electronic transitions is utilized to study heavy-quark hadron decays. This provides a direct assessment of the wavefunction of the parent hadron if the momentum distribution of the open flavor dec[...]![]()
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Inspired by the results of Jonas, Einsenhart, Demoulin, and Bianchi on the permutability property of classical geometrical transformations of conjugate nets and its reductions-of pseudo-orthogonal, pseudo-symmetric, and pseudo-Egorov types-dress[...]![]()
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The paper presents some basic facts concerning the formulation of the gauge invariance property of the electromagnetic field in terms of differentiable manifolds. For example, the gauge potentials are identified as differential one-forms on the [...]![]()
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We propose an algorithm for the reduction of observational noise in chaotic multivariate time series. The algorithm is based on a maximum likelihood criterion, and its goal is to reduce the mean distance of the points of the cleaned time series [...]![]()
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A modification of Weyl's theory of the electromagnetic field is presented, such that the usual gravitational Lagrangian becomes invariant under the corresponding definition of gauge transformation. As another advantage the problem of the we[...]![]()
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Mártil de la Plaza, Ignacio ; González Díaz, Germán ; García, S. ; Castán, E. ; Dueñas, S. ; Fernández, M. | American Institute of Physics | 1998-01-01We have obtained Al/SiNx:H/InP metal-insulator-semiconductor devices depositing SiNx:H thin films by the electron cyclotron resonance plasma method at 200 degrees C. The electrical properties of the structures were analyzed according to capacita[...]![]()
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Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2005Micro- and nanotubes, and other elongated structures of SnO_2 as wires and rods, were grown after sintering in argon flow at temperatures ranging from 1350 degrees C to 1500 degrees C. The morphology and luminescence properties of these structur[...]![]()
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Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2005-02-15Sintering SnO_2 under argon flow at temperatures in the range of 1350-1500 degreesC causes the formation of wires, rods, and tubes on the sample surface. At high temperatures of the mentioned range, microwires with lengths of hundreds of microns[...]![]()
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Carcelen, V. ; Hidalgo Alcalde, Pedro ; Rodríguez Fernández, J. ; Dieguez, E. | American Institute of Physics | 2010-05-01The II-VI compound semiconductor cadmium zinc telluride (CZT) is very useful for room temperature radiation detection applications. In the present research, we have successfully grown Bi doped CZT single crystals with two different zinc concentr[...]![]()
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Carcelen, V. ; Hidalgo Alcalde, Pedro ; Rodríguez Fernández, J. ; Dieguez, E. | American Institute of Physics | 2010-05-01The II-VI compound semiconductor cadmium zinc telluride (CZT) is very useful for room temperature radiation detection applications. In the present research, we have successfully grown Bi doped CZT single crystals with two different zinc concent[...]![]()
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Antoranz Canales, Pedro ; Miranda Pantoja, José Miguel ; Sebastián Franco, José Luis ; Cámara, M. ; Fonseca González, Mª Victoria | American Institute of Physics | 2005-05-01We report on this work a model to accurately predict the electrical behavior of double-heterostructure GaN/SiC blue light-emitting diodes up to microwave frequencies. A procedure to extract the series resistance (R-s) from the reflection coeffic[...]![]()
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Marín Palacios, María Pilar ; Marcos, M. ; Hernando Grande, Antonio | American Institute of Physics | 2010-06-28In this letter, we report the experimental work carried out to study and improve the magnetomechanical coupling on magnetic microwires. A good magnetoelastic response, with magnetoelastic coupling factor k=0.43, has been obtained by control of b[...]![]()
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Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Lucía Mulas, María Luisa ; San Andres Serrano, Enrique | American Institute of Physics | 2007-08-15Hafnium oxide films were deposited by high pressure reactive sputtering using different deposition pressures and times. The composition, morphology, and optical properties of the films, together with the sputtering process growth kinetics were i[...]![]()
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Si implantations into undoped In0.53Ga0.47As have been carried out to obtain n-layers suitable for device applications. Different doses and energies have been analyzed. After rapid thermal annealing at 850-875 degrees C for 10-20 s, electrical a[...]![]()
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Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Olea Ariza, Javier ; San Andres Serrano, Enrique | American Institute of Physics | 2010-05-15In this paper, we present a detailed characterization of high quality layers of Si implanted with Ti at high doses. These layers are intended to the formation of an intermediate band (IB) solar cell. The main requirement to obtain an IB material[...]![]()
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Martínez Arnáiz, R. M. ; Maldonado, J. ; Montes Gutiérrez, David ; Eiroa, C. ; Montesinos, B. ; Ribas, I. ; Solano, E. | American Institute of Physics | 2009We present the most recent results of our ongoing long-term high resolution spectroscopic study of nearby (d ? 25 pc) FGK stars which aim is to characterize the local properties of the Galaxy, in particular the star-formation history. A through [...]![]()
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Ruiz Gómez, Sandra ; González Barrio, Miguel Ángel ; Mascaraque Susunaga, Arantzazu ; Pérez García, Lucas ; Serrano, Aída ; Guerrero, Rubén ; Muñoz, Manuel ; Lucas, Irene ; Foerster, Michael ; Aballe, Lucía | American Institute of Physics | 2018-10-22The spin Hall effect (SHE) provides an efficient tool for the production of pure spin currents, essentially for the next generation of spintronics devices. Giant SHE has been reported in Cu doped with 0.5% Bi grown by sputtering, and larger valu[...]![]()
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Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | American Institute of Physics | 1996-07-15Cathodoluminescence (CL) of YBa_2Cu_3O_(7-x) single crystals has been investigated in the scanning electron microscope, Some regions of the crystals, generally related to steps or other growth features, show enhanced CL Intensity. Spectra show t[...]![]()
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Junge, M. ; Palazuelos Cabezón, Carlos ; Parcet, J. ; Perrin, M. | American Institute of Physics | 2015-02We obtain hypercontractivity estimates for a large class of semigroups defined on finite-dimensional matrix algebras Mn. These semigroups arise from Poisson-like length functions ? on Zn × Zn and provide new hypercontractive families of quantum [...]![]()
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Crespo del Arco, Patricia ; Marín, P. ; Hernando Grande, Antonio | American Institute of Physics | 2000-05-01We present experimental results on the hysteresis and relaxation of Fe/Ba hexaferrite composite samples prepared by ball milling starting from precursor Fe and Ba hexaferrite particles. Our results show that, for maximum applied fields of up to [...]![]()
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Schmidt, Rainer ; Mayrhofer, Patrick ; Schmid, Ulrich ; Bittner, Achim | American Institute of Physics | 2019-02-26In this work, a comprehensive characterization of metal-insulator-semiconductor structures by impedance spectroscopy is demonstrated for the case of electrically insulating, highly c-axis oriented, 600 nm sputter-deposited AlN films on n-Si subs[...]![]()
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Ruiz-Valdepeñas Martín de Almagro, Luis ; Vélez, M. ; Valdés Bango, F. ; Álvarez Prado, L.M. ; García Alonso, F.J. ; Martín, J.I. ; Navarro Palma, Elena ; Alameda, J.M. ; Vicent López, José Luis | American Institute of Physics | 2014-06-07Magnetization reversal processes have been studied in hybrid magnetic/superconducting Nd-Co/Nb bilayers by the comparison of out-of-plane magnetic hysteresis loops and superconducting phase diagrams as a function of magnetic layer thickness and [...]![]()
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Temperature dependent in-plane impedance spectroscopy measurements were carried out in order to analyze the charge transport properties of functional oxide NiMn_(2)O_(4) negative temperature coefficient thermistor films deposited via aerosol dep[...]![]()
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Bartolomé Vílchez, Javier ; Hidalgo Alcalde, Pedro ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2014-04-21Electric field induced mechanical resonances of In2O3 microrods are studied by in-situ measurements in the chamber of a scanning electron microscope. Young's moduli of rods with different cross-sectional shapes are calculated from the resonance [...]![]()
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Liu, Yaohua ; Tornos, J. ; te Velthuis, S. G. E. ; Freeland, J. W. ; Zhou, H. ; Steadman, P. ; Bencok, P. ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo | American Institute of Physics | 2016-04In artificial multiferroics hybrids consisting of ferromagnetic La_(0.7)Sr_(0.3)MnO_(3) (LSMO) and ferroelectric BaTiO_(3) epitaxial layers, net Ti moments are found from polarized resonant soft x-ray reflectivity and absorption. The Ti dichroic[...]![]()
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Garcia, J. A. ; Remon, A. ; Piqueras de Noriega, Javier | American Institute of Physics | 1987-10-01The effect of the addition of Bi and Mn on the photoluminescence from ZnO ceramics has been investigated. The effect of the presence of impurities on the green luminescence band can be compared to the effect of oxidizing treatments. A narrow gre[...]![]()
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We have measured the electrical and optical properties of blue light-emitting diodes (LEDs) based on III-V nitrides. The current-voltage characteristic is described by means of the relation I = I-0 exp(alpha V). In this equation alpha is tempera[...]![]()
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Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Prado Millán, Álvaro del ; San Andres Serrano, Enrique | American Institute of Physics | 2004-05-15The influence of H on the composition and atomic concentrations of Si, O, and N of plasma deposited SiOxNyHz films was investigated. The bonding scheme of H was analyzed by Fourier-transform infrared spectroscopy. The composition and absolute co[...]![]()
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Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Prado Millán, Álvaro del | American Institute of Physics | 2008-11-01Al/HfO(2)/SiN(x):H/n-Si metal-insulator-semiconductor capacitors have been studied by electrical characterization. Films of silicon nitride were directly grown on n-type silicon substrates by electron cyclotron resonance assisted chemical vapor [...]![]()
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The possibility of downhill instead of two-state folding for proteins has been a very controversial topic which arose from recent experimental studies. From the theoretical side, this question has also been accomplished in different ways. Given [...]![]()
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Cremades Rodríguez, Ana Isabel ; Narayanan, V.C. ; Piqueras de Noriega, Javier ; Lima, A.P. ; Ambacher, O. ; Stutzmann, M. | American Institute of Physics | 2001-11-01Plasma-induced molecular beam epitaxial AlInGaN heterostructures have been characterized by spatial resolved cathodoluminescence and x-ray energy dispersive microanalysis. Competitive incorporation of Al and In has been observed, with the format[...]![]()
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Kodama, Y. ; Konopelchenko, Boris ; Martínez Alonso, Luis ; Medina Reus, Elena | American Institute of Physics | 2005-11A general scheme for determining and studying hydrodynamic type systems describing integrable deformations of algebraic curves is applied to cubic curves. Lagrange resolvents of the theory of cubic equations are used to derive and characterize t[...]![]()
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Jones, D. B. ; da Costa, R.F. ; Varella, M. T. do N. ; Bettega, M. H. F. ; Lima, M. A. P. ; Blanco Ramos, Francisco ; García, G. ; Brunger, M. J. | American Institute of Physics | 2016-04-14We report absolute experimental integral cross sections (ICSs) for electron impact excitation of bands of electronic-states in furfural, for incident electron energies in the range 20-250 eV. Wherever possible, those results are compared to corr[...]![]()
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Linearized hydrodynamic equations for a nonuniform anisotropic fluid are obtained from the exact Mori-Zwanzig equations for the conserved densities. In the particular case of a two-phase system with a planar equilibrium interface, these equation[...]![]()
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Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Olea Ariza, Javier | American Institute of Physics | 2012-12-01We have analyzed by means of Rutherford backscattering spectrometry (RBS) the Ti lattice location and the degree of crystalline lattice recovery in heavily Ti implanted silicon layers subsequently pulsed laser melted (PLM). Theoretical studies h[...]![]()
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González López, Artemio ; Hernández Heredero, Rafael ; Beffa, Gloria Marí | American Institute of Physics | 1997-11In this paper we find an explicit formula for the most general vector evolution of curves on RPn?1 invariant under the projective action of SL(n, R). When this formula is applied to the projectivization of solution curves of scalar Lax operators[...]![]()
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Mialdun, A. ; Sechenyh, V. ; Legros, J. C. ; Ortiz de Zárate Leira, José María ; Shevtsova, V. | American Institute of Physics | 2013-09-14We present a comprehensive analysis of experimental results obtained for Fickian diffusion in the benchmark ternary liquid mixture of 1,2,3,4-tetrahydronaphthalene, isobutylbenzene, and dodecane (nC(12)) with equal mass fractions. Isothermal dif[...]![]()
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Mártil de la Plaza, Ignacio ; García Hemme, Eric ; García Hernansanz, Rodrigo ; González Díaz, Germán ; Olea Ariza, Javier ; Prado Millán, Álvaro del | American Institute of Physics | 2012Ti supersaturated Si layers with two different thicknesses have been obtained on the top of a Si substrate by means of ion implantation and pulsed laser melting processes. Time-of-flight Secondary Ion Mass spectrometry (ToF-SIMS) measurements sh[...]![]()
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Velasco, J. L. ; Castejón, F. ; Fernández Pérez, Luis Antonio ; Martín Mayor, Víctor ; Tarancón, A. | American Institute of Physics | 2008The ion Drift Kinetic Equation (DKE) which describes the ion coUisional transport is solved for the TJ-II device plasmas. This non-linear equation is computed by peribrming a mean field iterative calculation. In each step of the calculation, a F[...]![]()
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Campoamor Stursberg, Otto Ruttwig ; Rausch de Traubenberg, Michel | American Institute of Physics | 2008We study and classify kinematical algebras which appear in the framework of Lie superalgebras or Lie algebras of order three. All these algebras are related through generalised Inonü-Wigner contractions from either the orthosymplectic superalgeb[...]![]()
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A Klein–Gordon field with a derivative fourth order self?coupling is studied. It is shown that the kinks of the model form singlets, doublets, or triplets of electric charge, according to the values of the coupling constants.![]()
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Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Olea Ariza, Javier | American Institute of Physics | 2009-09-01We have studied the laser thermal annealing (LTA) effects on single crystal GaP. The samples have been analyzed by means of Raman spectroscopy, glancing incidence x-ray diffraction (GIRXD), and transmission electron microscopy (TEM) measurements[...]![]()
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Gálvez, F. ; Valle, J. del ; Gómez Gutiérrez, Alicia ; González Herrera, Elvira María ; Navarro Palma, Elena ; Vicent López, José Luis ; Soriano, N. ; Mora, B. ; Rollano, V. ; Gargiani, P. | American Institute of Physics | 2020-06-01The development of multilayered materials with engineered magnetic properties compels a deep knowledge of physical properties at the atomic scale. The magnetic anisotropy is a key property in these materials. This work accounts for the magnetic [...]![]()
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Li, W. B. ; Zhang, K. J. ; Sengers, Jan V. ; Gammon, R. W. ; Ortiz de Zárate Leira, José María | American Institute of Physics | 2000-05-22We have performed light-scattering measurements in dilute and semidilute polymer solutions of polystyrene in toluene when subjected to stationary temperature gradients. Five solutions with concentrations below and one solution with a concentrati[...]![]()
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The DaveyStewartson equation is considered from the point of view of the bilinear formalism of the Kyoto school. Multidromion solutions are constructed in terms of free fermions and their asymptotic properties are characterized. The dynamical pr[...]![]()
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We study some global properties of a self?interacting Dirac field which has been used to construct a classical stable model of the hydrogen atom. It is shown that the normalization condition produces the correct values of both charge and spin an[...]![]()
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Slow nanocrystallization driving dynamics can be affected by the combination of two factors: sample residual stresses and sample geometry. This effect is evidenced at the initial stages of nanocrystallization of amorphous CoFeSiBCuNb magnetic mi[...]![]()
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Domínguez-Adame Acosta, Francisco ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Prieto, P. | American Institute of Physics | 1992-03-15Visible and near infrared cathodoluminescence of Bi_2Sr_2CaCu_2O_x and YBa_2Cu_3O_(7-x) films is investigated in the scanning electron microscope. In particular, possible analogies in the cathodoluminescence of both systems have been analyzed. T[...]![]()
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Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 1998-01-01Cathodoluminescence (CL) in the scanning electron microscope is used to investigate the nature of defects responsible for the luminescence associated with round and hexagonal-like topographic features of GaN:Si films. Round hillocks of the size [...]![]()
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Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 1995-09-01The effect of laser cutting on the structure of a chemical vapor deposited diamond film has been investigated by cathodoluminescence (CL) in the scanning electron microscope. The variation of particle morphology and CL spectra as a function of t[...]![]()
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Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Remon, A. ; Garcia, J. A. ; Santos, M. T. ; Dieguez, E. | American Institute of Physics | 1998-06-15Changes on the defect structure of Bi12GeO20 (BGO) and Bi12SiO20 (BSO) crystals induced by thermal treatments and laser irradiation have been studied by means of cathodoluminescence in the scanning electron microscope. The results have been comp[...]![]()
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We review the N_c and m_? dependence of the rho(770) and ? (or f_0(600) resonances generated with the Inverse Amplitude Method. The ? N_c behavior is at odds with being dominantly a q?q? state, but there is a hint of a subdominant q?q?o componen[...]![]()
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Rivero, G. ; Crespo del Arco, Patricia ; Pulido, E ; Garcia-Escorial, A. ; Hernando Grande, Antonio ; Vázquez, M. ; Vallet, M. ; Gonzalez-Calbet, J. | American Institute of Physics | 1991-04-15The specific magnetic moment, coercive force, anisotropy field, and saturation magnetostriction constant have been measured in Co(1-x)P(x) amorphous ribbons with 0.04 less-than-or-equal-to x less-than-or-equal-to 0.27. Differential scanning calo[...]![]()
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Marín, P. ; López, M. ; Vlad, A. ; Hernando Grande, Antonio ; Ruiz González, M. L: ; González Calbet, J. M. | American Institute of Physics | 2006-07-17We present the possibility of tuning the nanocrystalline microstructure of Co-rich samples by magnetic field annealing. Custom assembly of nucleated grains, aligned in the field direction, has been observed by means of high resolution transmissi[...]![]()
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Joshi, Amish G ; Kryukov, Sergiy A. ; De Long, Lance E. ; González Herrera, Elvira María ; Navarro Palma, Elena ; Villegas, Javier E. ; Vicent López, José Luis | American Institute of Physics | 2007-05-01We report vibrating reed and superconducting quantum interference device magnetometer data that exhibit prominent dips or oscillations of the superconducting (SC) onset temperature, Delta T(C)(H)approximate to 0.01-0.7 K, for a [Nb(23 nm)/Ni(5 n[...]![]()
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Nemes, Norbert Marcel ; Visani, C. ; León Yebra, Carlos ; Gárcia Hernández, M. ; Simón, F. ; Feher, T. ; te Velthuis, S. G. E. ; Hoffmann, A. ; Santamaría Sánchez-Barriga, Jacobo | American Institute of Physics | 2010-07-19We report a memory concept utilizing ferromagnet/superconductor/ferromagnet La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7)/La_(0.7)Ca_(0.3)MnO_(3) thin film hybrid structures. The orientation of the magnetic field with respect to the ferromagnetic e[...]![]()
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Navarro Palma, Elena ; Vélez, M. ; Huttel, Y. ; Pérez Junquera, A. ; Martín, J. Y. ; Lima, O. F. de ; Cebollada, A. ; Alameda, J. M. ; Vicent López, José Luis | American Institute of Physics | 2009-02-01Shifted hysteresis loops characteristic of the exchange bias effect between a ferromagnet and an antiferromagnet are demonstrated in structures formed by a 2.5 nm Cr layer deposited on top of an array of Fe nanoislands (Cr/Fe-nanoislands). This [...]![]()
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Pérez de Lara, David ; Castaño, F. J. ; Ng, B. G. ; Körner, H. S. ; Dumas, R. K. ; González Herrera, Elvira María ; Liu, Kai ; Ross,, C. A. ; Schuller, Ivan K. ; Vicent López, José Luis | American Institute of Physics | 2011-10-31Strong superconducting pinning effects are observed from magnetic landscapes produced by arrays of circular rings with varying magnetic remanent states. The collective and the background pinning of superconducting Nb films is strongly enhanced b[...]![]()
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Lopez Maldonado, K. L. ; Presa Muñoz del Toro, Patricia de la ; Flores Tavizon, E. ; Farias Mancilla, J: R: ; Matutes Aquino, J. A. ; Hernando Grande, Antonio ; Elizalde Galindo, J. T. | American Institute of Physics | 2013-05-07Magnetite nanostructured powder samples were synthesized by aging chemical method. Phase, structural, and magnetic properties were characterized. X-ray diffraction patterns showed cubic magnetite pure phase, with average crystallite size, [...]![]()
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Díaz-Guerra Viejo, Carlos ; Pérez García, Lucas ; Piqueras de Noriega, Javier ; Chioncel, M. F. | American Institute of Physics | 2009-11-15Magnetic transitions in single-crystal alpha-F_2O_3 (hematite) nanowires, grown by thermal oxidation of iron powder, have been studied in the range of 5-1023 K with a superconducting quantum interference device below room temperature and with a [...]![]()
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Valle Granda, Javier del ; Gómez, A. ; González, E. M. ; Vicent López, José Luis | American Institute of Physics | 2016-10-24In order to compare magnetic and non-magnetic pinning, we have nanostructured two superconducting films with the regular arrays of pinning centers: Cu (non-magnetic) dots in one case and Py (magnetic) dots in the other. For low applied magnetic [...]![]()
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Prieto, P. ; Vivas, P. ; Campillo, G. ; Baca, E. ; Castro, L. F. ; Varela del Arco, María ; Ballesteros, C. ; Villegas, J. E. ; Arias Serna, Diego ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo | American Institute of Physics | 2001-06-15We report on the magnetic and superconducting properties of La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7) (LCMO/YBCO) superlattices. For a constant LCMO layer thickness of 6 unit cells (u.c.), resistance and susceptibility measurements show superco[...]![]()
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Lopez Maldonado, K. L. ; Vazquez Zubiate, L. ; Presa Muñoz del Toro, Patricia de la ; Matutes Aquino, J. A. ; Elizalde Galindo, J. T. | American Institute of Physics | 2014-05-07Manganese and Zinc ferrites were prepared by solid state reaction. The resulting powders were pressed into pellets and heat treated at 1100 ?C. The samples were characterized by using X-ray diffraction, pure phases of zinc ferrite (ZnFe²O?) and [...]![]()
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Guerrero, E. ; Munoz-Marquez, M. A. ; Fernández, A. ; Crespo del Arco, Patricia ; Hernando, A. ; Lucena, R. ; Conesa, J. C. | American Institute of Physics | 2010-03-15In the last years, the number of studies performed by wholly independent research groups that confirm the permanent magnetism, first observed in our research lab, for thiol-capped Au nanoparticles (NPs) has rapidly increased. Throughout the year[...]![]()
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Mathematics is the language of science however, in secondary and high school education students are not made aware of the strong implications behind this statement. This is partially caused because mathematical training and the modelling of natu[...]![]()
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We present a theoretical analysis of quasicrystals (QCs) as potential thermoelectric materials. We consider a self-similar density of states model and extend the framework introduced in [G. D. Mahan and J. O. Sofo, Proc. Natl. Acad. Sci. U.S.A. [...]![]()
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Kholmetskii, Alexsander L. ; Missevitch, Oleg V. ; Smirnov Rueda, Román | American Institute of Physics | 2007We start with the general approach based on conventional solutions to Maxwell's equations and show that in the near zone of macroscopic electromagnetic sources the electromotive force produced in receiving loop antenna is intimately linked to th[...]![]()
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Vázquez Peñas, José R. ; Ortiz de Zárate Leira, José María ; Khayet Souhaimi, Mohamed | American Institute of Physics | 2008-08-15We present experimental results of the thermal conductivity of several nanofluids prepared by dispersing nanoparticles of SiO(2) and CuO in water and ethylene glycol at various concentrations up to approximate to 5% in mass fraction. The measure[...]![]()
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Roldán, É. ; Martínez, I. A. ; Dinis Vizcaíno, Luis Ignacio ; Rica, R.A. | American Institute of Physics | 2014-06-09We report on the measurement of the average kinetic energy changes in isothermal and nonisothermal quasistatic processes in the mesoscale, realized with a Brownian particle trapped with optical tweezers. Our estimation of the kinetic energy chan[...]![]()
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Using a field theoretical, QCD inspired Hamiltonian formulated in the Coulomb gauge, relativistic many-body calculations are reported which reproduce the semiquantitative features of the observed meson and lattice glueball spectrums. Dynamical c[...]![]()
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Lucía Mulas, María Luisa ; Sánchez Quesada, Francisco ; Santamaría Sánchez-Barriga, Jacobo ; Sefrioui, Zouhair ; Varela del Arco, María ; Arias Serna, Diego ; Loos, G. ; Navacerrada, M.A. | American Institute of Physics | 1998-12-07We have studied the effect of He+ irradiation on the electrical resistivity and Curie temperature of ferromagnetic SrRuO3 thin films. An evolution from metallic to insulating behavior is observed when He+ ion fluence is increased, suggesting a m[...]![]()
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Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Prado Millán, Álvaro del ; San Andres Serrano, Enrique | American Institute of Physics | 2003-07-15The effect of rapid thermal annealing (RTA) processes on the structural properties of SiOxNyHz films was investigated. The samples were deposited by the electron cyclotron resonance plasma method, using SiH4, O-2 and N-2 as precursor gases. For [...]![]()
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Carmona Tejero, Noemi ; Bouzas, V. ; Jiménez de la Morena, J. ; García, M. A. | American Institute of Physics | 2010We present here some miniaturised devices designed for the detection of nanorods in water and blood media. The devices use light emitting diodes as monochromatic light sources and Si photodiodes for detection. Devices working on transmission mod[...]![]()
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The dynamics of thermoplastic-photoconductor films is reviewed. A theory of thermoplastic film deformation is presented for a three-layer structure in air with modified boundary conditions. The amplitude of the deformation A versus the spatial f[...]![]()
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Cabero Piris, M. ; Nagy, K. ; Gallego, F. ; Sander, A. ; Rio, M. ; Cuellar, F.A. ; Tornos, J. ; Hernández Martín, David ; Nemes, Norbert Marcel ; Mompean, F. ; Gárcia Hernández, M. ; Rivera Calzada, Alberto Carlos ; Sefrioui, Zouhair ; Reyren, N. ; Feher, T. ; Varela del Arco, María ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo | American Institute of Physics | 2017-09Controlling magnetic anisotropy is an important objective towards engineering novel magnetic device concepts in oxide electronics. In thin film manganites, magnetic anisotropy is weak and it is primarily determined by the substrate, through indu[...]![]()
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Jimeno Romero, Pablo ; Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la | American Institute of Physics | 2012-07In the context of f(R) modified gravity theories we determine that the black holes existence is determined by the sign of a parameter dependent of the mass, the charge, the spin and the scalar curvature. We obtain the different astrophysical obj[...]![]()
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Jaulent, Marcel ; Manna, Miguel A. ; Martínez Alonso, Luis | American Institute of Physics | 1989-08A multiseries integrable model (MSIM) is defined as a family of compatible flows on an infinite-dimensional Lie group of N-tuples of formal series around N given poles on the Riemann sphere. Broad classes of solutions to a MSIM are characterized[...]![]()
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We review our work on the ? and ? resonances derived from the Inverse Amplitude Method. In particular, we study the leading 1/N_c behavior of the resonances masses and widths and their evolution with changing m_?. The 1/Nc expansion gives a clea[...]![]()
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Ngai, K. L. ; Lunkenheimer, P. ; León Yebra, Carlos ; Schneider, U. ; Brand, R. ; Lodl, A. | American Institute of Physics | 2001-07-15Previous dielectric relaxation measurements of glycerol and propylene carbonate and new results on propylene glycol performed below the conventional glass transition temperatures T_(g) after long periods of aging all show that the excess wing (a[...]![]()
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Nogales Díaz, Emilio ; Joachimsthaler, I. ; Heiderhoff, R. ; Piqueras de Noriega, Javier ; Balk, L.J. | American Institute of Physics | 2002-07-15Near-field cathodoluminescence (NFCL) has been used to characterize hydride vapor phase epitaxy grown n-GaN films. This technique can obtain high resolution luminescence images and perform local measurements of the diffusion length for minority [...]![]()
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Analysis of the question whether or not a given dynamical system has closed trajectories is of great importance for applications and represents independent theoretical interest. The authors give a new geometrical proof of the extension of the Be[...]![]()
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We say that several scalar time series are dynamically coupled if they record the values of measurements of the state variables of the same smooth dynamical system. We show that much of the information lost due to measurement noise in a target t[...]![]()
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Fernández Pérez, Luis Antonio ; Martín Mayor, Víctor ; Muñoz Sudupe, Antonio ; Yllanes, D. ; otros, ... | American Institute of Physics | 2009The out of equilibrium evolution for an Edwards?Anderson spin glass is followed for a tenth of a second, a long enough time to let us make safe predictions about the behaviour at experimental scales. This work has been made possible by Janus, an[...]![]()
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Fernández Álvarez-Estrada, Ramón ; Pastor, I. ; Guasp, J. ; Castejón, F. | American Institute of Physics | 2012-06The classical nonlinear incoherent Thomson scattering power spectrum from a single relativistic electron with incoming laser radiation of any intensity, investigated numerically by the present authors in a previous publication, displayed both an[...]![]()
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In this paper we analyze Abelian diagonal orthogonally transitive space–times with spacelike orbits for which the matter content is a stiff perfect fluid. The Einstein equations are cast in a suitable form for determining their geodesic complete[...]