Electrical resistivity and specific heat of SmS in its gold phase have been investigated. Above P_Δ=20.3em0exGPa, the resistivity is characteristic of a metallic heavy fermion compound. Ac calorimetry points out a phase transition with the occurrence of a new ground state. Analyses of the resistivity and of the specific heat and comparison with a microscopic probe (¹⁴⁹Sm nuclear forward scattering) allow us to identify the onset of antiferromagnetism. Discussion will be made on the interplay of gap closing (P<P_Δ), long-range magnetism (P>P_Δ), and valence state.
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Haga et al. (2004) studied this question.
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