Oxygen hole state in A-site ordered perovskite ACu3Ru 4O12 (A = Na, Ca, and La) probed by resonant X-ray emission spectroscopy

Masaichiro Mizumaki, Takashi Mizokawa, Akane Agui, Soutaro Tanaka, Hiroshi Takatsu, Shingo Yonezawa, Yoshiteru Maeno

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In contrast to ordinary perovskites ABO3, A-site ordered perovskites AA′3B4O12 include transition metals in both A′ and B sites. The A′-O, B-O, and A′-B interactions in A-site ordered perovskites give rise to various physical properties. In this study, we report the O 1s and Cu 2p x-ray absorption spectroscopy (XAS) and resonant x-ray emission spectroscopy (RXES) study on the A-site ordered perovskite ACu3Ru4O12 (A = Na, Ca, and La). Hartree-Fock calculation and cluster model calculation were carried out to analyze O 1s and Cu 2p XAS spectra. The O 1s RXES spectra indicate that the number of O 2p holes increases in going from La to Ca to Na. In addition, the Cu 2p RXES spectra reveal that the charge-transfer (CT) energy decreases in going from La to Ca to Na. The decrease of CT is consistent with our calculations and suggest an increase of the O 2p holes in the ground state. The substitution of the A site ion changes not only the carrier concentration in the Ru 4d and Cu 3d bands but also the O 2p to Cu 3d CT energy.

Original languageEnglish
Article number024709
Journaljournal of the physical society of japan
Volume82
Issue number2
DOIs
Publication statusPublished - 2013 Feb 1
Externally publishedYes

Keywords

  • A-site ordered perovskite compounds
  • Resonant x-ray emission spectroscopy
  • Ru oxides
  • X-ray absorption Spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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