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Exchange Interactions and Fluctuations in CeB6

K. N. Lee*

Brian Bell

  • W. W. Hansen Laboratories of Physics, Stanford University, Stanford, California 94305

  • Department of Applied Physics, Stanford University, Stanford, California 94305

  • *Kent Fellow of the Danforth Foundation. Present address: Institute of Governmental Studies, University of California, Berkeley, Calif. 94720.
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Phys. Rev. B 6, 1032 – Published 1 August, 1972

DOI: https://doi.org/10.1103/PhysRevB.6.1032

Abstract

We report measurements of the low-temperature specific heat of CeB6 and discuss their significance in the light of earlier studies of this compound. The large specific heat above the antiferromagnetic ordering at 2.31 K is interpreted with the aid of a decorated Ising model. This model permits us to combine exchange and crystal field interactions in a simplified, but exact, calculation of the thermodynamic properties of a magnetic system including the effects of fluctuations. The analysis gives independent support to the proposal by Nickerson and White that the exchange in the crystal field excited state is substantially stronger than the ground-state exchange in CeB6. We also comment on the possibility of extending such an analysis to other magnetic rare-earth hexaborides.

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Phys. Rev. B 6, 1032– Published 1 August, 1972
  • Received 24 January 1972

© 1972 American Physical Society

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