CaCu3Ru4 O12: 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. LeeG. Ryu, A. C. Komarek, S. Sugano, Y. Shimakawa, A. Tanaka, T. Mizokawa, J. Kuneš, L. H. Tjeng, A. Hariki

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6 Citations (Scopus)


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 core-level 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.

Original languageEnglish
Article number011017
JournalPhysical Review X
Issue number1
Publication statusPublished - 2022 Mar

ASJC Scopus subject areas

  • General Physics and Astronomy


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