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.
@article{arxiv.cond-mat/0504303,
title = {Polaron Transport in the Paramagnetic Phase of Electron-Doped Manganites},
author = {J. L. Cohn and C. Chiorescu and J. J. Neumeier},
journal= {arXiv preprint arXiv:cond-mat/0504303},
year = {2009}
}