ELECTRONIC STRUCTURE OFCoSe2

H. Sato, F. Nagasaki, Y. Kani, S. Senba, Y. Ueda, A. Kimura and M. Taniguchi
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H. Sato: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
F. Nagasaki: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
Y. Kani: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
S. Senba: Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-8526, Japan
Y. Ueda: Kure National College of Technology, Agaminami 2-2-11, Kure 737-8506, Japan
A. Kimura: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
M. Taniguchi: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan;

Surface Review and Letters (SRL), 2002, vol. 09, issue 02, 1315-1319

Abstract: The valence-band and conduction-band electronic structure of pyrite-typeCoSe2has been investigated by means of ultraviolet-photoemission, synchrotron-radiation-photoemission and inverse-photoemission spectroscopies. The fully occupied Co 3d states witht2gsymmetry are observed as a main peak at -1.0 eV relative to the Fermi level(EF), and the partially filled Co 3d states withegsymmetry are observed as a shoulder at theEFside of the main peak. On the other hand, the structure due to the unoccupied Coegstates appears at 0.6 eV in the inverse-photoemission spectrum. The electronic structure ofCoSe2is similar to that ofCoS2. The electron correlation is more important forCoSe2than forCoS2.

Date: 2002
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DOI: 10.1142/S0218625X02003731

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