Polaron Transport in the Paramagnetic Phase of Electron-Doped Manganites

Details Polaron Transport in the Paramagnetic Phase of Electron-Doped Manganites Polaron Transport in the Paramagnetic Phase of Electron-Doped Manganites

2005-04-12

arxiv.org/abs/cond-mat/0504303v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pp., 7 Fig.s, to be published, PRB

Scientific paper

10.1103/PhysRevB.72.024422

The electrical resistivity, Hall coefficient, and thermopower as functions of temperature are reported for lightly electron-doped Ca(1-x)La(x)MnO(3)(0 <= x <= 0.10). Unlike the case of hole-doped ferromagnetic manganites, the magnitude and temperature dependence of the Hall mobility for these compounds is found to be inconsistent with small-polaron theory. The transport data are better described by the Feynman polaron theory and imply intermediate coupling (alpha \~ 5.4) with a band effective mass, m*~4.3 m_0, and a polaron mass, m_p ~ 10 m_0.

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