Hall-Effect Sign Anomaly and Small-Polaronic Conduction in (La1-xGdx)0.67Ca0.33MnO3
Abstract
The Hall coefficient of Gd-doped La2/3Ca1/3MnO3 exhibits Arrhenius behavior over a temperature range from 2Tc to 4Tc, with an activation energy very close to 2/3 that of the electrical conductivity. Although both the doping level and thermoelectric coefficient indicate hole-like conduction, the Hall coefficient is electron-like. This unusual result provides strong evidence in favor of small-polaronic conduction in the paramagnetic regime of the manganites.
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