Off-stoichiometric effect on the transport and pseudogap characteristics of Fe2 VGa

C. S. Lue, W. J. Lai, C. C. Chen, Y. K. Kuo

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20 Citations (Scopus)

Abstract

We report the investigations of transport and thermoelectric measurements on the Heusler compounds Fe2VGa1-x over the temperature range from 10 to 300 K. It is found that the electrical resistivity and Seebeck coefficient are very sensitive to the off-stoichiometry, while the thermal conductivity is relatively little affected with the composition change. With a removal of Ga content from the stoichiometric Fe2VGa, a sign change in the Seebeck coefficient accompanied by a broad minimum at around 130 K is observed. The latter feature can be interpreted as thermal excitation of carriers across band edges, in accord with band-structure calculations. Furthermore, an analysis of lattice thermal conductivity indicates that the off-stoichiometric effect on both electrical resistivity and Seebeck coefficient is not influenced by chemical disorder.

Original languageEnglish
Pages (from-to)4283-4290
Number of pages8
JournalJournal of Physics Condensed Matter
Volume16
Issue number24
DOIs
Publication statusPublished - 2004 Jun 23

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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