Annealing effect on the reduction of Fermi-level density of states in CoTiSb: NMR evidence

C. S. Lue, C. F. Chen, Fu Kuo Chiang, M. W. Chu

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13 Citations (Scopus)

Abstract

With the aim to examine the variation in the electronic properties of CoTiSb due to heat treatment, a comparative study of the as-cast and annealed samples using C 59 o nuclear magnetic resonance (NMR) spectroscopy was performed. All NMR observations clearly indicate a significant change in the local electronic characteristics for the annealed sample. The spin-lattice relaxation rate measurements further provide an estimate of Co-d Fermi-level density of states, Nd (EF), indicating a substantial reduction in Nd (EF) for the specimen with heat treatment. This finding gives a microscopic interpretation for the larger electrical resistivity and Seebeck coefficient in the annealed half-Heusler alloys, as the samples with higher electrical resistivity and Seebeck coefficient usually are associated with lower carrier densities in the vicinity of the Fermi level.

Original languageEnglish
Article number174202
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number17
DOIs
Publication statusPublished - 2009 Nov 5

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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