The magnetothermoelectric power in the Y- and Ho-doped La0.9Te0.1MnO3

摘要

We present the results of a systematic study of thermoelectric power S(T) at zero field and applied magnetic field in the nonmagnetic Y- and magnetic Ho-doped manganites La0.9Y(Ho)(x)Te0.1MnO3 (0.05 <= x <= 0.15). For x <= 0.10 samples, an additional positive magnetothermoelectric power (MTEP) is induced by Y and Ho doping below Curie temperature T-C besides a large negative MTEP in the vicinity of T-C. The Ho-doped compounds have larger resistivity rho and larger S compared to the Y-doped compounds in the same concentration. The magnetic disorder introduced by Ho doping can play an important role in affecting the electronic and thermal transport properties of the sample. (C) 2007 Elsevier Ltd. All rights reserved.