Spin-dependent transport in phase-separated manganites
K.I. Kugel (1), A.L. Rakhmanov (1), A.O. Sboychakov (1), M.Yu. Kagan, (2), I.V. Brodsky (2), A.V. Klaptsov (2) ((1) Institute for Theoretical and, Applied Electrodynamics, Moscow, Russia, (2) Kapitza Institute for Physical, Problems, Moscow, Russia)
TL;DR
This paper presents a model for spin-dependent charge transfer in phase-separated manganites, explaining their temperature and magnetic field-dependent resistivity, magnetoresistance, and magnetic susceptibility, aligning theory with experimental observations.
Contribution
It introduces a novel model based on spin-dependent tunnelling between ferromagnetic regions in manganites, capturing their non-metallic behavior.
Findings
Model successfully explains temperature dependence of resistivity.
Magnetic field effects on magnetoresistance are accurately described.
Main features of phase-separated state are identified.
Abstract
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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Taxonomy
TopicsMagnetic and transport properties of perovskites and related materials · Electronic and Structural Properties of Oxides · Electrical and Thermal Properties of Materials