Spin-dependent transport in phase-separated manganites

Details Spin-dependent transport in phase-separated manganites Spin-dependent transport in phase-separated manganites

2003-12-11

arxiv.org/abs/cond-mat/0312294v1

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, 12 figures, submitted to Journal of Experimental and Theoretical Physics (Zh. Eksp. Teor. Fiz., v.125 (2), 2004)

Scientific paper

Starting from the assumption that ferromagnetically correlated regions exist in manganites even in the absence of long-range magnetic order, we construct a model of charge transfer due to the spin-dependent tunnelling of charge carriers between such regions. This model allows us to analyze the temperature and magnetic field dependence of resistivity, magnetoresistance, and magnetic susceptibility of phase-separated manganites in the temperature range corresponding to non-metallic behavior. The comparison of theoretical and experimental results reveals the main characteristics of the phase-separated state.

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