Doping and Field-Induced Insulator-Metal Transitions in Half-Doped Manganites

Abstract

We argue that many properties of the half-doped manganites may be understood in terms of a new two-(eg electron)-fluid description, which is energetically favorable at intermediate Jahn-Teller (JT) coupling. This emerges from a competition between canting of the core spins of Mn promoting mobile carriers and polaronic trapping of carriers by JT defects, in the presence of CE, orbital and charge order. We show that this explains several features of the doping and magnetic field induced insulator-metal transitions, as the particle-hole asymmetry and the smallness of the transition fields.

arXiv comment4 pages, 4 figures

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• Long Range Coulomb Interactions and Nanoscale Electronic Inhomogeneities in Correlated Oxides
• Jahn-Teller distortions and phase separation in doped manganites
• Instabilities and Insulator-Metal transitions in Half-Doped Manganites induced by Magnetic-Field and Doping
• Temperature evolution of superparamagnetic clusters in single-crystal La0.85Sr0.15CoO3 from nonlinear magnetic ac response and neutron depolarization
• The Effect of Disorder in an Orbitally Ordered Jahn-Teller Insulator
• Conductance Switching and Inhomogeneous Field Melting in the Charge Ordered Manganites
• Colossal magnetoresistance in topological Kondo insulator