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Carmona, J. M. ; Cruz, A. ; Fernández Pérez, Luis Antonio ; Jiménez, S. ; Martín Mayor, Víctor ; Muñoz Sudupe, Antonio ; Pech, J. ; Ruiz Lorenzo, J. J. ; Tarancón, A. ; Téllez, P. | Elsevier Science BV | 2003-05-08It is shown that a bosonic formulation of the double-exchange model, one of the classical models for magnetism, generates dynamically a gauge-invariant phase in a finite region of the phase diagram. We use analytical methods, Monte Carlo simulat[...]texto impreso
Cruz, A. ; Fernández Pérez, Luis Antonio ; Jiménez, S. ; Ruiz Lorenzo, J. J. ; Tarancón, A. | American Physical Society | 2003-06-01We study the fluctuation-dissipation relations for a three dimensional Ising spin glass in a magnetic field both in the high temperature phase as well as in the low temperature one. In the region of times simulated we have found that our results[...]texto impreso
Alonso, J. L. ; Cruz, A. ; Fernández Pérez, Luis Antonio ; Jiménez, S. ; Martín Mayor, Víctor ; Ruiz-Lorenzo, J. J. ; Tarancón, A. | American Physical Society | 2005-01-14The phase diagram of the simplest approximation to double-exchange systems, the bosonic double-exchange model with antiferromagnetic (AFM) superexchange coupling, is fully worked out by means of Monte Carlo simulations, large-N expansions, and v[...]texto impreso
We numerically study aging for the Edwards-Anderson model in three and four dimensions using different temperature-change protocols. In D=3, time scales a thousand times larger than in previous work are reached with the Spin Update Engine SUE m[...]
