Low temperature magnetic behavior of Ce7Ni3

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Abstract

Low-temperature specific heat (Cp) (70 mK < T < 30 K) and AC magnetic susceptibility (χ) (70 mK < T < 3 K) measurements on Ce7Ni3 (under applied magnetic fields up to B = 6 T) are presented. The maxima in Cp (at 1.55K) and in χ (at 1.85 K) are related to an antiferromagnetic (AF) type transition. The experimental results are interpreted in terms of three Ce sublattices (1CeI, 3CeII and 3CeIII atoms per formula unit) of the Th7Ni3-type structure. These sublattices correspond to the three different Ce local environments. According to the entropy gain the AF order is related to the CeI sublattice and the CeII atoms behave as heavy fermions, with γLT ≈ 2.7 J/CeII-at K2 and a characteristic temperature of TK ≈ 4 K. The CeIII atoms are responsible for an intermediate valence behavior with γHf ≈ 0.3J/CeIII-at K2 and a characteristic temperature of T0 ≈ 70 K, which is confirmed by the ln T dependence of the electrical resistivity.

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