Información del autor
Autor Sefrioui, Zouhair |
Documentos disponibles escritos por este autor (39)
texto impreso
Hernández Martín, David ; Gallego Toledo, Fernando ; Tornos Castillo, Javier ; Rouco Gómez, Víctor ; Beltrán Finez, Juan Ignacio ; Munuera, C. ; Sánchez Manzano, David ; Cabero Piris, Mariona ; Cuéllar Jiménez, Fabián Andrés ; Arias Serna, Diego ; Sánchez Santolino, Gabriel ; Mompean, F. J. ; Gárcia Hernández, M. ; Rivera Calzada, Alberto Carlos ; Pennycook, S. J. ; Varela del Arco, María ; Muñoz, M. C. ; Sefrioui, Zouhair ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2020-12-30The persistence of ferroelectricity in ultrathin layers relies critically on screening or compensation of polarization charges which otherwise destabilize the ferroelectric state. At surfaces, charged defects play a crucial role in the screening[...]texto impreso
Peña, V. ; Sefrioui, Zouhair ; Arias Serna, Diego ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo ; Varela del Arco, María ; Pennycook, S. J. ; Martínez, J. L. | American Physical Society | 2004-06-08Here we examine the ferromagnetic/superconducting proximity effect in half-metallic ferromagnetic La_(0.7)Ca_(0.3)MnO_(3) and high-T_(c) superconducting YBa_(2)Cu_(3)O_(7) artificial structures. We have found experimental evidence for the coupli[...]texto impreso
Lucía Mulas, María Luisa ; Sánchez Quesada, Francisco ; Santamaría Sánchez-Barriga, Jacobo ; Sefrioui, Zouhair ; Arias Serna, Diego ; Loos, G. ; Navacerrada, M.A. | Amer Inst Physics | 2000-05-29We have studied the effect of He+ irradiation with doses in the range 10(12)-2x10(15) cm(-2) on two high-temperature superconducting structures: YBa2Cu3O7-x (YBCO) films and YBa2Cu3O7-x/PrBa2Cu3O7 (YBCO/PBCO) superlattices. In particular we have[...]texto impreso
Sefrioui, Zouhair ; Arias Serna, Diego ; Varela del Arco, María ; Villegas, J. E. ; López de la Torre, M. A. ; León Yebra, Carlos ; Loos, G. D. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 1999-12-01Current-voltage (I-V) characteristics were used to investigate the response of the vortex-glass (VG) phase transition in high-quality epitaxial YBa_(2)Cu_(3)O_(7-?) films in magnetic fields up to 7 T. We show that varying the oxygen content, the[...]texto impreso
Varela del Arco, María ; Arias Serna, Diego ; Sefrioui, Zouhair ; León Yebra, Carlos ; Ballesteros, C. ; Pennycook, S. J. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2002-10-01We report the effects of epitaxial strain and deoxygenation on high quality [YBa_(2)Cu_(3)O_(7-x)(YBCO)_(N) /PrBa_(2)Cu_(3)O_(7)(PBCO)_(5)]_(1000 Å) superlattices, with 1texto impreso
Varela del Arco, María ; Grogger, W. ; Arias Serna, Diego ; Sefrioui, Zouhair ; León Yebra, Carlos ; Ballesteros, C. ; Frishnan, K.M. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2001-05-28Charge neutrality and stoichiometry impose severe restrictions on the mechanisms of epitaxial growth of complex oxides. The fundamental question arises of what is the minimum growth unit when sample thickness is reduced beyond the size of the un[...]texto impreso
Nemes, Norbert Marcel ; Rocci, Mirko ; Sefrioui, Zouhair ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2010-03-01We report on the magnetic anisotropy controlled modulation of the superconductivity in La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7??)/La_(0.7)Ca_(0.3)MnO_(3) ferromagnet/superconductor/ferromagnet hybrids with biaxial easy axes. The magnetoresista[...]texto impreso
Garcia Barriocanal, Javier ; Pérez Muñoz, Ana Mª ; Sefrioui, Zouhair ; Arias Serna, Diego ; Varela del Arco, María ; León Yebra, Carlos ; Pennycook, Stephen J. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2013-06-11We examine the effect of interface disorder in suppressing superconductivity in coherently grown ultrathin YBa_(2)Cu_(3)O_(7) (YBCO) layers on SrTiO_(3) (STO) in YBCO/STO superlattices. The termination plane of the STO is TiO_(2) and the CuO cha[...]texto impreso
Varela del Arco, María ; Grogger, W. ; Arias Serna, Diego ; Sefrioui, Zouhair ; León Yebra, Carlos ; Vázquez, L. ; Ballesteros, C. ; Krishnan, K.M. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2002-11-01We report on the growth mechanism of YBa_(2)Cu_(3)O_(7-x). Our study is based on an analysis of ultrathin YBa_(2)Cu_(3)O_(7-x) (YBCO) layers in c-axis-oriented YBa_(2)Cu_(3)O_(7-x)/PrBa_(2)Cu_(3)O_(7)superlattices. We have found that the release[...]texto impreso
Bruno, F. Y. ; Garcia Barriocanal, Javier ; Torija, M. ; Rivera Calzada, Alberto Carlos ; Sefrioui, Zouhair ; Leighton, C. ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo | American Institute of Physics | 2008-02-25Electrical transport properties of heteroepitaxial p-n junctions made of La_(0.8)Sr_(0.2)CoO_(3) and SrTi_(0.99)Nb_(0.01)O_(3) were studied. Junctions display highly rectifying current-voltage characteristics over a wide temperature range (20–30[...]texto impreso
López de la Torre, M. A. ; Sefrioui, Zouhair ; Arias Serna, Diego ; Varela del Arco, María ; Villegas, J. E. ; Ballesteros, C. ; León Yebra, Carlos | American Physical Society | 2001-01-05We report on the effect of light ion irradiation on the low-temperature electrical resistivity of ferromagnetic SrRuO_(3) thin films. Fresh samples displayed a ferromagnetic transition at T_(c)? 160 K, good metallic behavior (?(300 K)~400??cm, d[...]texto impreso
Liu, Yaohua ; Cuéllar Jiménez, Fabián Andrés ; Sefrioui, Zouhair ; Freeland, J. W. ; Fitzsimmons, M. R. ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo ; te Velthuis, S. G. E. | American Physical Society | 2013-12-11We report a strong effect of interface-induced magnetization on the transport properties of magnetic tunnel junctions consisting of ferromagnetic manganite La_(0.7)Ca_(0.3)MnO_(3) and insulating cuprate PrBa_(2)Cu_(3)O_(7). Contrary to the typic[...]texto impreso
Varela del Arco, María ; Arias Serna, Diego ; Sefrioui, Zouhair ; León Yebra, Carlos ; Ballesteros, C. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2000-11-01The effects of epitaxial strain in ultrathin YBa_(2)Cu_(3)O_(7-?) layers have been investigated by x-ray diffraction and transmission electron microscopy. The samples used were high quality [YBa_(2)Cu_(3)O_(7-?)(YBCO)_(N)/PrBa_(2)Cu_(3)O_(7)(PBC[...]texto impreso
Sefrioui, Zouhair ; Arias Serna, Diego ; Morales, F. ; Varela del Arco, María ; León Yebra, Carlos ; Escudero, R. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2001-01-01We report on transport and magnetic relaxation measurements of deoxygenated YBa_(2)Cu_(3)O_(7-?) thin films. Strongly oxygen depleted samples with ?=0.6 are produced to ensure the pure two-dimensional nature of the vortex system. Linear resistiv[...]texto impreso
Nemes, Norbert Marcel ; Visani, C. ; Sefrioui, Zouhair ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo ; Iglesias, M. ; Mompean, F. ; Gárcia Hernández, M. | American Physical Society | 2010-01We examine the interplay between ferromagnetism and superconductivity in bilayer and trilayer heterostructures based on Co, YBa_(2)Cu_(3)O_(7-?) (YBCO), and La_(0.7)Ca_(0.3)MnO_(3) (LCMO) thin films grown on SrTiO_(3) substrates with typical thi[...]texto impreso
Sefrioui, Zouhair ; Arias Serna, Diego ; Peña, V. ; Villegas, J. E. ; Varela del Arco, María ; Prieto, P. ; León Yebra, Carlos ; Martínez, J. L. ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 2003-06-13We study the interplay between magnetism and superconductivity in high-quality YBa_(2)Cu_(3)O_(7)(YBCO)/La_(0.7)Ca_(0.3)MnO_(3)(LCMO) superlattices. We find evidence for the YBCO superconductivity depression in the presence of the LCMO layers. W[...]texto impreso
Peña, V. ; Sefrioui, Zouhair ; Arias Serna, Diego ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo ; Martínez, J. L. ; te Velthuis, S. G. E. ; Hoffmann, A. | American Physical Society | 2005-02-11We show magnetoresistance in excess of 1000% in trilayers containing highly spin-polarized La_(0.7)Ca_(0.3)MnO_(3) and high-T_(c) superconducting YBa_(2)Cu_(3)O_(7). This large magnetoresistance is reminiscent of the giant magnetoresistance (GMR[...]texto impreso
Shen, Xiao ; Pennycook, Timothy J. ; Hernández Martín, David ; Pérez, Ana ; Varela del Arco, María ; Puzyrev, Yevgeniy S. ; León Yebra, Carlos ; Sefrioui, Zouhair | Wiley-Blackwell | 2016-08-19Memristive switching serves as the basis for a new generation of electronic devices. Memristors are two-terminal devices in which the current is turned on and off by redistributing point defects, e.g., vacancies, which is difficult to control. M[...]texto impreso
Bruno, Flavio Yair ; Grisolia, M. N. ; Visani, C. ; Valencia, S. ; Varela del Arco, María ; Aburdan, R. ; Tornos, J. ; Rivera Calzada, Alberto Carlos ; Ünal, A. A. ; Pennycook, S. J. ; Sefrioui, Zouhair ; León Yebra, Carlos ; Villegas, J. E. ; Santamaría Sánchez-Barriga, Jacobo ; Barthélémy, A. ; Bibes, M. | Nature Publishing Group | 2015-02-17At interfaces between complex oxides, electronic, orbital and magnetic reconstructions may produce states of matter absent from the materials involved, offering novel possibilities for electronic and spintronic devices. Here we show that magneti[...]texto impreso
Villegas, J. E. ; Sefrioui, Zouhair ; Varela del Arco, María ; González Herrera, Elvira María ; Santamaría Sánchez-Barriga, Jacobo ; Vicent López, José Luis | American Physical Society | 2004-04We study angular dependent magnetoresistance in the vortex-liquid phase of epitaxial YBa2Cu3O7 thin films and YBa_2Cu_3O_7/PrBa_2Cu_3O_7 superlattices. Superlattices were grown with different PrBa_2Cu_3O_7 thickness in order to tune coupling bet[...]texto impreso
Galceran, R. ; Balcells, Ll. ; Martínez-Boubeta, C. ; Bozzo, B. ; Cisneros-Fernández, J. ; Mata, M. de la ; Magén, C. ; Arbiol, J. ; Tornos, J. ; Cuéllar Jiménez, Fabián Andrés ; Sefrioui, Zouhair ; Cebollada, A. ; Golmar, F. ; Huesos, L.E. ; Casanova, F. ; Santamaría Sánchez-Barriga, Jacobo ; Martínez, B. | American Physical Society | 2015-09-16We report on magnetotransport properties on La_(0.7)Sr_(0.3)MnO_(3)/MgO/Fe tunnel junctions grown epitaxially on top of (001)-oriented SrTiO_(3) substrates by sputtering. It is shown that the magnetoresistive response depends critically on the M[...]texto impreso
Varela del Arco, María ; Sefrioui, Zouhair ; Arias Serna, Diego ; Navacerrada, M. A. ; Lucía Mulas, María Luisa ; López de la Torre, M. A. ; León Yebra, Carlos ; Loos, G. D. ; Sánchez Quesada, Francisco ; Santamaría Sánchez-Barriga, Jacobo | American Physical Society | 1999-11-08The structure of high quality [YBCO_(N)/PBCO_(M)]_(1000 Å) superlattices, with N ranging between 1 and 12 unit cells and M = 5 unit cells, grown by high oxygen pressure sputtering, is analyzed. Intracell atomic structure of the layers along the [...]texto impreso
Visani, C. ; Cuellar, F. ; Pérez Muñoz, Ana Mª ; Sefrioui, Zouhair ; León Yebra, Carlos ; Santamaría Sánchez-Barriga, Jacobo ; Villegas, Javier E. | American Physical Society | 2015-07-31We experimentally study the superconducting proximity effect in high-temperature superconductor/halfmetallic ferromagnet YBa_(2)Cu_(3)O_(7)/La_(2/3)Ca_(1/3)MnO_(3) junctions, using conductance measurements. In particular, we investigate the magn[...]texto impreso
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[...]texto impreso
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[...]