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Antiferromagnetism and enhanced specific heat in CeM2Sn2 (M = Ni, Ir, Cu, Rh, Pd and Pt)

  • Author(s): Beyermann, WP
  • Hundley, MF
  • Canfield, PC
  • Godart, C
  • Selsane, M
  • Fisk, Z
  • Smith, JL
  • Thompson, JD
  • et al.
Abstract

Specific heat, DC susceptibility, and resistivity measurements on annealed, polycrystalline samples of CeM Sn , where M = Ni, Ir, Cu, Rh, Pd, or Pt, indicate that each of these compounds orders antiferromagnetically with transition temperatures ranging from T = 4.1 to ≈ 0.5 K. All these materials have significant enhancements of the specific heat just before the transition, which can be as large as ∼ 3.5J/mol K in some cases. Provided the enhanced heat capacities above T are associated with large effective masses, the anomalously low ordering temperature and the very large C/T suggest that T and the Kondo temperature T are comparable, making these materials particularly attractive for studying the interplay between these competing interactions. The susceptibility for each member of the series except M = Ir follows a Curie-Weiss behavior with a high-temperature effective moment μ ∼ 2.5μ Ce and a small negative paramagnetic Curie temperature. © 1991. 2 2 N N N K eff B 2

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