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Electronic structure and excitonic effects in Sm1−x R x S prior to collapse

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Zeitschrift für Physik B Condensed Matter

Abstract

X-ray photoemission spectra of Sm1−x R x S (R=Ca, Y, Gd and Th) in the range prior to collapse (“black phase”) exhibit only divalent samarium components. The 4f final state energy is found independent of lattice constant, but sensitive to 5d band screening. The fully screened final state 4f 55d,6 H, which is also involved in the interconfiguration fluctuation process, is found to reach the Fermi energy in a gradual insulator to metal transition. The results are interpreted to show that the modifications of the band structure which give rise to the phase transition are confined to the 5d level.

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Authors and Affiliations

  1. Bell Laboratories, Murray Hill, 07974, New Jersey, USA

    G. K. Wertheim & I. Nowik

  2. Institut für Festkörperforschung, Kernforschungsanlage Jülich GmbH, Postfach 1913, D-5170, Jülich 1, Germany

    Maurice Campagna

  3. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-5000, Köln 41, Germany

    Maurice Campagna

  4. Hebrew University, Jerusalem, Israel

    I. Nowik

Authors
  1. G. K. Wertheim
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  2. I. Nowik
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  3. Maurice Campagna
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Wertheim, G.K., Nowik, I. & Campagna, M. Electronic structure and excitonic effects in Sm1−x R x S prior to collapse. Z Physik B 29, 193–197 (1978). https://doi.org/10.1007/BF01321182

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  • DOI: https://doi.org/10.1007/BF01321182

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