Electronic nature of layered oxysulfide Sr2-xCa xCu2CoO2S2 with CoO2 planes

K. Ito, T. Endo, T. Kubodera, Y. Kamihara, M. Matoba, H. Kitô

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Abstract

We have studied the electronic nature of the layered oxysulfide Sr2-x Cax Cu2 CoO2 S2 which has strongly correlated CoO2 square planes. These materials exhibit narrow-gap semiconducting behavior and the conduction mechanism depends on the temperature. Valence band x-ray photoemission spectroscopy spectra show that Ca doping and the production of Sr defects cause the generation of a quasiparticle band near the Fermi level. These phenomena suggest that the materials are changing from correlated semiconductors to bad metals.

Original languageEnglish
Article number08F705
JournalJournal of Applied Physics
Volume99
Issue number8
DOIs
Publication statusPublished - 2006 May 25

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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