Study on Electric Resistivity and Thermoelectric Power in (La_<0.8>Ca_<0.2>)nO_<3-y>

概要

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Electric resistivities and thermoelectric powers of the system (La. .Ca...)MnO. ,were measured in several samples with y less than 0.07, in which the amounts of theoxygen deficiencies y were carefully controlled. The electrical conduction at T >T. (T.denotes the magnetic transition temperature) is of an activation type, while at T< T., itchanges from a degenerate type to an activation type with increasing y. The thermoelec-tric power at T>T. is proportional to l fT in all samples and that at T< T. shown ametalic behavior in the samples with ,V'=0.00 and 0.025. The activation energyestimated from the electric resistivity at T>T. is about three times larger than thatestimated from the thermoelectric power. These experimental results are discussed onthe basis of the conventional semiconductor model.
社団法人日本物理学会の論文
1982-04-15