Unveiling First Order CMR Transitions in the Two-Orbital Model for Manganites - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: Large scale Monte Carlo simulation results for the two-orbital model formanganites, including Jahn-Teller lattice distortions, are here presented. Athole density x=1-4 and in the vicinity of the region of competition between theferromagnetic metallic and spin-charge-orbital ordered insulating phases, thecolossal magnetoresistance CMR phenomenon is observed with amagnetoresistance ratio ~10,000% Our main result is that this CMR transition isfound to be of first order in some portions of the phase diagram, in agreementwith early results from neutron scattering, specific heat, and magnetization,thus solving a notorious discrepancy between experiments and previoustheoretical studies. The first-order characteristics of the transition survive,and are actually enhanced, when weak quenched disorder is introduced.



Author: Cengiz ┼×en, Gonzalo Alvarez, Elbio Dagotto

Source: https://arxiv.org/







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