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Physical Review Letters
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Spectroscopically observed valence mixing in SmS and related compounds

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Abstract

Photoemission spectra for semiconducting SmS and metallic Sm0.5Y0.5S give evidence of strong configuration interaction of localized states near the Fermi level involved in semiconductor-to-metal phase transitions and in unusual transport and magnetic properties. An analysis of the observed multiplet structure in photoemission spectra for semiconducting SmS shows a localized state of a mixed f6+f5d character. © 1974 The American Physical Society.

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Physical Review Letters

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