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Composition and temperature dependence of the thermoelectric power of Ni2+xMn1-xGa alloys

P. A. Bhobe, J. H. Monteiro, J. C. Cascalheira, S. K. Mendiratta, K. R. Priolkar, P. R. Sarode

cond-mat.mtrl-sciarXiv:cond-mat/0603752

Abstract

The thermoelectric power (TEP) measurements have been carried out to investigate the changes in the electronic structure associated with the intermartensitic and martensitic transitions in Ni2+xMn1-xGa (0 x 0.19). The samples have been characterized by a.c. magnetic susceptibility measurements. The correlation between the TEP and the microstructural changes sensitive to the increasing Ni content in Ni2+xMn1-xGa has been investigated. The changes in the density of states as reflected in the temperature variation of the TEP are consistent with the conclusions drawn from the Jahn-Teller mechanism of lattice distortion.

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