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

Mizumaki, Masaichiro*; Mizokawa, Takashi*; Agui, Akane; Tanaka, Sotaro*; Takatsu, Hiroshi*; Yonezawa, Shingo*; Maeno, Yoshiteru*

Journal of the Physical Society of Japan, 82(2), p.024709_1 - 024709_6, 2013/02

https://doi.org/10.7566/JPSJ.82.024709

In this study, we report the O 1 and Cu 2 X-ray absorption spectroscopy (XAS) and resonant X-ray emission spectroscopy (RXES) study on the A-site ordered perovskite ACuRuO (A = Na, Ca, and La). Hartree-Fock calculation and cluster model calculation were carried out to analyze O 1 and Cu 2 XAS spectra. The O 1 RXES spectra indicate that the number of O 2 holes increases in going from La to Ca to Na. In addition, the Cu 2 RXES spectra reveal that the charge-transfer energy decreases in going from La to Ca to Na.