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Ballesteros, H. G. ; Carmona, J. M. ; Fernández Pérez, Luis Antonio ; Tarancón, A. | Elsevier Science BV | 1998-02-12We study the antiferromagnetic O(N). N model in the F_(4) lattice. Monte Carlo simulations are applied for investigating the behavior of the transition for N = 2,3. The numerical results show a first order nature but with a large correlation len[...]texto impreso
Alonso, J. L. ; Ballesteros, H.G. ; Campos, I. ; Carmona, J. M. ; Clemente Gallardo, J. ; Fernández Pérez, Luis Antonio ; Íñiguez, D. ; Martín Mayor, Víctor ; Muñoz Sudupe, Antonio ; Tarancón, A. ; Ullod, C. L. | Elsevier | 1997-02We present antiferromagnetism as a mechanism capable of modifying substantially the phase diagram and the critical behaviour of statistical mechanical models. This is particularly relevant in four dimensions, due to the connection between second[...]texto impreso
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
Ballesteros, H. G. ; Carmona, J. M. ; Fernández Pérez, Luis Antonio ; Martín Mayor, Víctor ; Muñoz Sudupe, Antonio ; Tarancón, A. | Amer Physical Soc | 1997-04-15We study the antiferromagnetic RP^(2) model in four dimensions. We find a second order transition with two order parameters, one ferromagnetic and the other antiferromagnetic. The antiferromagnetic sector has mean- field critical exponents and a[...]texto impreso
Alonso, J. L. ; Carmona, J. M. ; Clemente Gallardo, J. ; Fernández Pérez, Luis Antonio ; Íñiguez, D. ; Tarancón, A. ; Ullod, C. L. | Elsevier Science BV | 1996-05-23We study the phase diagram of the four dimensional king model with first and second neighbour couplings, especially in the antiferromagnetic region, by using Mean Field and Monte Carlo methods. From the latter, all the transition lines seem to b[...]
