Breakdown of the lattice polaron picture in La0.7Ca0.3MnO3 single crystals

Details Breakdown of the lattice polaron picture in La0.7Ca0.3MnO3 single crystals Breakdown of the lattice polaron picture in La0.7Ca0.3MnO3 single crystals

1999-06-14

arxiv.org/abs/cond-mat/9906198v2

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 3 figures, final version to appear in Phys. Rev. B Rapid

Scientific paper

10.1103/PhysRevB.61.R9225

When heated through the magnetic transition at Tc, La0.7Ca0.3MnO3 changes from a band metal to a polaronic insulator. The Hall constant R_H, through its activated behavior and sign anomaly, provides key evidence for polaronic behavior. We use R_H and the Hall mobility to demonstrate the breakdown of the polaron phase. Above 1.4Tc, the polaron picture holds in detail, while below, the activation energies of both R_H and the mobility deviate strongly from their polaronic values. These changes reflect the presence of metallic, ferromagnetic fluctuations, in the volume of which the Hall effect develops additional contributions tied to quantal phases.

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