Barla A, Sanchez JP, Haga Y, Lapertot G, Doyle BP, Leupold O, Rüffer R, Abd-Elmeguid MM, Lengsdorf R, Flouquet J. Pressure-induced magnetic order in golden SmS.
PHYSICAL REVIEW LETTERS 2004;
92:066401. [PMID:
14995258 DOI:
10.1103/physrevlett.92.066401]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2003] [Indexed: 05/23/2023]
Abstract
High pressure 149Sm nuclear forward scattering experiments have been performed on the nonmagnetic semiconductor SmS. We present the first clear evidence that the closure of the insulating gap at p(Delta) approximately 2 GPa coincides with the appearance of magnetic order. The pressure-induced magnetic phase transition has some first order character and suggests that the Sm ions are nearly trivalent at p(Delta). A Gamma(8) quartet crystal field ground state with a value of approximately 0.5 micro(B) for the samarium magnetic moment is inferred from our results. Considerable magnetic short range order is observed above the ordering temperature inferred from macroscopic measurements.
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