The metal-nonmetal transition in NiS studied by the Mössbauer effect of 57Fe |
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| Authors: | J.M.D. Coey H. Roux Buisson A. Chamberod |
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| Affiliation: | Groupe Transitions de Phases, C.N.R.S., B.P. 166, 38 042. Grenoble, France;Départment de Recherche Fondamentale, C.E.N.G., B.P. 85, 38 041. Grenoble, France |
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| Abstract: | Mössbauer spectra of 57Fe impurities in α NiS show an abrupt collapse of the hyperfine splitting at Tt = 260 K, the nonmetal-metal transition; the extrapolated Néel point is ～420 K. Below Tt, it appears that iron adjacent to a vacancy is low-spin. There us evidence of substantial d-electrons delocalisation above Tt. β NiS does not order magnetically down to 4 K. |
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