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CaCu$_3$Ru$_4$O$_{12}$: a high Kondo-temperature transition metal oxide

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arxiv 2112.02898 v1 pith:CBXKQD4T submitted 2021-12-06 cond-mat.str-el

D. Takegami , C. Y. Kuo , K. Kasebayashi , J.-G. Kim , C. F. Chang , C. E. Liu , C. N. Wu , D. Kasinathan
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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
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keywords cacucalculationsdmftionskondometaloxidetransition
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abstract

We present a comprehensive study of CaCu$_3$Ru$_4$O$_{12}$ using bulk sensitive hard and soft x-ray spectroscopy combined with local-density approximation (LDA) + 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 Cu$^{2+}$ 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 CaCu$_3$Ru$_4$O$_{12}$ must be classified as a Kondo system and that the Kondo temperature is in the range of 500-1000 K.

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