The thermoelectric power of ferromagnetically ordered ZnxCuyCrzSe4 single crystals

摘要

The absolute thermoelectric power and the electrical resistivity of the ZnxCuyCrzSe4 ferromagnetic single crystals have been measured in <0 0 1> direction and in the temperature range from 5 to 400 K between y = 0.81 and 0.97. The above investigations showed that all compounds under study are p-type metallic conductors. It was observed that the thermoelectric power can be explained concerning only the diffusion component (which varies linearly with temperature) and a magnon contribution. The positive slope of the linear part of thermopower does not depend significantly on the Cu concentration y in a sample. Generally, for single crystals with small defectiveness a high magnon peak is observed and its maximum is shifted into higher temperatures. For single crystals with high defectiveness the magnon peak is shifted into lower temperatures and its intensity is reduced. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 20]