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

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

2004-12-23

arxiv.org/abs/cond-mat/0412651v1

Phys. Rev. Lett. 94, 247207 (2005)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.247207

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.

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