Zobrazeno 1 - 10
of 51
pro vyhledávání: '"Aliaga, H."'
Publikováno v:
Physical Review B, 73, 224441 (2006)
The one- and two-orbital double-exchange models for manganites are studied using Monte Carlo computational techniques in the presence of a robust electron-phonon coupling (but neglecting the antiferromagnetic exchange $J_{\rm AF}$ between the localiz
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603221
Publikováno v:
Phys. Rev. B 73, 224426 (2006)
Using Monte Carlo simulations and the two eg-orbital model for manganites, the stability of the CE and A-type antiferromagnetic insulating states is analyzed when quenched disorder in the superexchange JAF between the t2g localized spins and in the o
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603181
Autor:
Aliaga, H.
Publikováno v:
Phys. Rev. B 71, 184404 (2005)
An algorithm is presented to calculate the electronic local time-dependent Green's operator for manganites-related hamiltonians. This algorithm is proved to scale with the number of states $N$ in the Hilbert-space to the 1.55 power, is able of parall
Externí odkaz:
http://arxiv.org/abs/cond-mat/0408687
A comprehensive analysis of half-doped manganites is presented using Monte Carlo simulations applied to the double-exchange model with cooperative Jahn-Teller lattice distortions in two dimensions. A variety of novel results are reported: (i) The pha
Externí odkaz:
http://arxiv.org/abs/cond-mat/0303513
Autor:
Aliaga, H., Causa, M. T., Tovar, M., Butera, A., Alascio, B., Vega, D., Leyva, G., Polla, G., Konig, P.
We present a study of the magnetic properties of the electron doped manganites Ca1-xYxMnO3 (for 0<=x<=0.25) in the paramagnetic regime. For the less doped samples (x<=0.1) the magnetic susceptibility, c(T), follows a Curie-Weiss (CW) law only for T >
Externí odkaz:
http://arxiv.org/abs/cond-mat/0211242
Autor:
Aliaga, H., Aligia, A. A.
Publikováno v:
Physica B 320, 34 (2002).
We propose a double exchange model to describe the RuO_2 planes of RuSr_2(Eu,Gd)Cu_2O_8. The Ru^+5 ions are described by localized spins, and additional electrons provided by the superconducting CuO_2 planes are coupled ferromagnetically to them by H
Externí odkaz:
http://arxiv.org/abs/cond-mat/0108286
Publikováno v:
Physica B 320, 75 (2002).
Experimental evidence show that in the magnetoresistive manganite Ca_(1-x) Y_xMnO_3, ferromagnetic (FM) polarons arises in an antiferromagnetic (AF) background, as a result of the doping with Yttrium. This hypothesis is supported in this work by clas
Externí odkaz:
http://arxiv.org/abs/cond-mat/0108284
Publikováno v:
Phys. Rev. B 64, 024422 (2001).
The ferromagnetic Kondo lattice model with an antiferromagnetic interaction between localized spins is a minimal description of the competing kinetic t and magnetic K energy terms which generate the rich physics of manganite systems. Motivated by the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0011342
Autor:
Aliaga, H., Causa, M. T., Butera, A., Alascio, B., Salva, H., Vega, M. Tovar D., Polla, G., Leyva, G., Konig, P.
We have studied structural, magnetic and transport properties as a function of temperature and magnetic field in the electron doped manganite YxCa1-xMnO3, for 0
Externí odkaz:
http://arxiv.org/abs/cond-mat/0010295
We present a simple model to study the electron doped manganese perovskites. The model considers the competition between double exchange mechanism for itinerant electrons and antiferromagnetic superexchange interaction for localized electrons. It rep
Externí odkaz:
http://arxiv.org/abs/cond-mat/9804248