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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
Alonso, J. L. ; Fernández Pérez, Luis Antonio ; Guinea, F ; Laliena, V. ; Martín Mayor, Víctor | American Physical Society | 2001-02-01It is shown that the double-exchange Hamiltonian, with weak antiferromagnetic interactions, has a rich variety of first-order transitions between phases with different electronic densities and/or magnetizations. The paramagnetic-ferromagnetic tr[...]texto impreso
Alonso, J. L. ; Fernández Pérez, Luis Antonio ; Guinea, F ; Laliena, V. ; Martín Mayor, Víctor | Elsevier | 2001-03-05The Hybrid Monte Carlo algorithm is adapted to the simulation of a system of classical degrees of freedom coupled to non self-interacting lattices fermions. The diagonalization of the Hamiltonian matrix is avoided by introducing a path-integral [...]texto impreso
Alonso, J. L. ; Fernández Pérez, Luis Antonio ; Guinea, F. ; Laliena, V. ; Martín Mayor, Víctor | American Physical Society | 2002-09-01Considering the disorder caused in manganites by the substitution Mn?Fe or Ga, we accomplish a systematic study of doped manganites begun in previous papers. To this end, a disordered model is formulated and solved using the variational mean-fie[...]texto impreso
Alonso, J. L. ; Fernández Pérez, Luis Antonio ; Martín Mayor, Víctor | Elsevier Science BV | 2000-05-11We study the linear response to an external electric field of a system of fermions in a lattice at zero temperature. This allows to measure numerically the Euclidean conductivity which turns out to be compatible with an analytical calculation fo[...]texto impreso
Alonso, J. L. ; Capitán, J. A. ; Fernández Pérez, Luis Antonio ; Guinea, F. ; Martín Mayor, Víctor | American Physical Society | 2001-08-01We study the phase diagram of the double exchange model, with antiferromagnetic interactions, in a cubic lattice both at zero and finite temperature. There is a rich variety of magnetic phases, combined with regions where phase separation takes [...]texto impreso
Alonso, J. L. ; Fernández Pérez, Luis Antonio ; Guinea, F. ; Lesmes, F. ; Martín Mayor, Víctor | American Physical Society | 2003-06-01The phase diagram of the double perovskites of the type Sr_(2-x)La_(x)FeMoO_(6) is analyzed, with and without disorder due to antisites. In addition to an homogeneous half metallic ferrimagnetic phase in the absence of doping and disorder, we fi[...]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[...]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
Alonso, J. L. ; Fernández Pérez, Luis Antonio ; Guinea, F. ; Laliena, V. ; Martín Mayor, Víctor | American Physical Society | 2011-02-01It has been recently shown that the double exchange Hamiltonian, with weak antiferromagnetic interactions, has a richer variety of first- and second-order transitions than previously anticipated, and that such transitions are consistent with the[...]
