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Thermal expansion study of Fe1-xCoxSi

  • Author(s): Mandrus, D
  • Sarrao, JL
  • Thompson, JD
  • Hundley, MF
  • Migliori, A
  • Fisk, Z
  • et al.
Abstract

We present measurements of the linear expansion coefficient, α, on Fe1-xCoxSi from 40 to 300 K and for x = 0, 0.02, 0.05, and 1. For the semiconducting samples (x = 0, 0.02, and 0.05) the results below 200 K are consistent with the presence of a small gap in the quasiparticle excitation spectrum; above 200 K there is an anomalous contribution to the thermal expansion that lacks a detailed explanation, but which is probably associated with the high density of conduction electrons found in FeSi above 200 K. © 1994.

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