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

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

doi:10.1063/1.2173638

Electronic nature of layered oxysulfide Sr_2-xCa _xCu₂CoO₂S₂ with CoO₂ planes

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

Department of Applied Physics and Physico-Informatics

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

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 language	English
Article number	08F705
Journal	Journal of Applied Physics
Volume	99
Issue number	8
DOIs	https://doi.org/10.1063/1.2173638
Publication status	Published - 2006

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.2173638

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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.",

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AU - Ito, K.

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AU - Kubodera, T.

AU - Kamihara, Y.

AU - Matoba, M.

AU - Kitô, H.

PY - 2006

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AB - 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.

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Electronic nature of layered oxysulfide Sr_2-xCa _xCu₂CoO₂S₂ with CoO₂ planes

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