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Low-energy excitations and the electronic specific heat of YbBiPt

  • Author(s): Robinson, RA
  • Kohgi, M
  • Osakabe, T
  • Trouw, F
  • Lynn, JW
  • Canfield, PC
  • Thompson, JD
  • Fisk, Z
  • Beyermann, WP
  • et al.
Abstract

Neutron scattering data from the cubic heavy-fermion compound YbBiPt are presented, along with an interpretation in terms of strongly broadened crystal-field levels. To first order, the ground state is sixfold degenerate, consisting of a doublet (7) and quartet (8). Integration over these levels reproduces the observed linear specific-heat coefficient of 8 J mol -1 K -2 to within 20%. At the lowest temperatures, an extra symmetry-forbidden splitting is observed. © 1995 The American Physical Society.

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