CaCu3Ru4O12: A High-Kondo-Temperature Transition-Metal Oxide

D. Takegami,C. Y. Kuo, K. Kasebayashi,J. -G. Kim,C. F. Chang,C. E. Liu,C. N. Wu, D. Kasinathan,S. G. Altendorf,K. Hoefer,F. Meneghin,A. Marino, Y. F. Liao,K. D. Tsuei,C. T. Chen, K. -T. Ko,A. Günther, S. G. Ebbinghaus,J. W. Seo,D. H. Lee,G. Ryu,A. C. Komarek, S. Sugano, Y. Shimakawa, A. Tanaka,T. Mizokawa,J. Kuneš,L. H. Tjeng,A. Hariki

PHYSICAL REVIEW X（2022）

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摘要

We present a comprehensive study of CaCu3Ru4O12 using bulk sensitive hard and soft x-ray spectroscopy combined with local-density approximation + dynamical mean-field theory (DMFT) calculations. Correlation effects on both the Cu and Ru ions can be observed. From the Cu 2p corelevel spectra, we deduce the presence of magnetic Cu2+ ions hybridized with a reservoir of itinerant electrons. The strong photon energy dependence of the valence band allows us to disentangle the Ru, Cu, and O contributions and, thus, to optimize the DMFT calculations. The calculated spin and charge susceptibilities show that the transition metal oxide CaCu3Ru4O12 must be classified as a Kondo system and that the Kondo temperature is in the range of 500-1000 K.

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