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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14 Citations (Scopus)

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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