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Thermal and magnetic properties of a low-temperature antiferromagnet Ce4Pt12Sn25

  • Author(s): Movshovich, R
  • Kurita, N
  • Lee, HO
  • Ho, PC
  • Maple, MB
  • Tokiwa, Y
  • Miclea, CF
  • Bauer, ED
  • Ronning, F
  • Sengupta, P
  • Vekhter, I
  • Fisk, Z
  • Thompson, JD
  • et al.
Abstract

We report specific heat (C) and magnetization (M) of single crystalline Ce4Pt12Sn25at temperature down to 50 mK and in fields up to 3 T. C/T exhibits a sharp anomaly at 180 mK, with a large jump in a Sommerfeld coefficient γ C/T of Δγ 30 J/molK2-Ce, which, together with corresponding cusp-like magnetization anomaly, indicate antiferromagnetic (AFM) ground state with Nel temperature TN0.18 K. Numerical calculations based on Heisenberg model reproduce well zero field specific heat data, and point to a very small Kondo scale TK, clearly placing Ce4Pt12Sn25in the weak exchange coupling J < Jclimit of the Doniac diagram. Magnetic field suppresses AFM state at H*0.7 T, much more rapidly than indicated by theoretical calculations. © Published under licence by IOP Publishing Ltd.

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