Valence fluctuations and correlated metallic states in A -site ordered perovskite oxides ACu3V4O12 ( A=Na, Ca, and Y)

Yosuke Morita, Takaaki Sudayama, Kou Takubo, Hiroshi Shiraki, Takashi Saito, Yuichi Shimakawa, Takashi Mizokawa

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Abstract

We have studied the electronic structure of A -site ordered perovskite oxides ACu3V4O12 (A=Na, Ca, and Y) using photoemission spectroscopy. V and Cu valence fluctuations are clearly observed in the V2p and the Cu2p core-level spectra. In going from A=Na to Ca to Y, electrons doped by the A -site substitution are mainly captured by the Cu site which has a mixture of +2 (d9) and +3 (d9 L, L is an O2p hole) and are partly distributed into the V site. The photoemission spectra near the Fermi level show a systematic change induced by the A -site substitution. The electronic structure of ACu3V4O12 is very different from that in Ca1-xSrxVO3 due to the existence of the Cu 3d electrons, and the unusual correlation effect in ACu 3V4O12 can be related to the valence fluctuations observed in the core-level spectra.

Original languageEnglish
Article number165111
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number16
DOIs
Publication statusPublished - 2010 Apr 20
Externally publishedYes

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Core levels
Perovskite
Oxides
Electronic structure
Substitution reactions
valence
oxides
Electrons
Photoemission
photoelectric emission
Photoelectron spectroscopy
Fermi level
substitutes
electronic structure
electrons
spectroscopy
perovskite

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Valence fluctuations and correlated metallic states in A -site ordered perovskite oxides ACu3V4O12 ( A=Na, Ca, and Y). / Morita, Yosuke; Sudayama, Takaaki; Takubo, Kou; Shiraki, Hiroshi; Saito, Takashi; Shimakawa, Yuichi; Mizokawa, Takashi.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 16, 165111, 20.04.2010.

Research output: Contribution to journalArticle

Morita, Yosuke ; Sudayama, Takaaki ; Takubo, Kou ; Shiraki, Hiroshi ; Saito, Takashi ; Shimakawa, Yuichi ; Mizokawa, Takashi. / Valence fluctuations and correlated metallic states in A -site ordered perovskite oxides ACu3V4O12 ( A=Na, Ca, and Y). In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 81, No. 16.
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AU - Shiraki, Hiroshi

AU - Saito, Takashi

AU - Shimakawa, Yuichi

AU - Mizokawa, Takashi

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