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Weak coupling magnetism in Ce4Pt12Sn25: a small exchange limit in the Doniach phase diagram.

  • Author(s): Lee, Han-Oh
  • Kurita, Nobuyuki
  • Ho, Pei-chun
  • Condron, Cathie L
  • Klavins, Peter
  • Kauzlarich, Susan M
  • Maple, MB
  • Movshovich, R
  • Bauer, ED
  • Thompson, JD
  • Fisk, Z
  • et al.
Abstract

Magnetic susceptibility, magnetization, specific heat, and electrical resistivity studies on single crystals of Ce4Pt12Sn25 reveal an antiferromagnetic transition at T(N) = 0.19 K, which develops from a paramagnetic state with a very large specific heat coefficient (C/T) of 14 J mol(-1) K(-2)-Ce just above T(N). On the basis of its crystal structure and these measurements, we argue that a weak magnetic exchange interaction in Ce4Pt12Sn25 is responsible for its low ordering temperature and a negligible Kondo-derived contribution to physical properties above T(N). The anomalous enhancement of specific heat above T(N) is suggested to be related, in part, to weak geometric frustration of f-moments in this compound.

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