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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
Azcoiti, V. ; Laliena, V. ; Luo, X.Q. ; Piedrafita, C.E. ; di Carlo, G. ; Galante, A. ; Grillo, A.F. ; Fernández Pérez, Luis Antonio ; Vladikas, A. | Amer Physical Soc | 1993-07-01We present a comprehensive exposition of a method for performing numerical simulations of lattice gauge theories with dynamical fermions. Its main aspects have been presented elsewhere. This work is a systematic study of the feasibility of the m[...]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[...]
