Record link: 
http://hdl.handle.net/20.500.12708/148094
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Title: 
CaCu₃Ru₄ O₁₂: A High-Kondo-Temperature Transition-Metal Oxide
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Citation: 
Takegami, D., Kuo, C. Y., Kasebayashi, K., Kim, J. G., Chang, C. F., Liu, C. E., Wu, C. N., Kasinathan, D., Altendorf, S. G., Hoefer, K., Meneghin, F., Marino, A., Liao, Y. F., Tsuei, K. D., Chen, C. T., Ko, K. T., Günther, A., Ebbinghaus, S. G., Seo, J. W., … Hariki, A. (2022). CaCu₃Ru₄ O₁₂: A High-Kondo-Temperature Transition-Metal Oxide. Physical Review X, 12(1), Article 011017. https://doi.org/10.1103/PhysRevX.12.011017
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Publisher DOI: 
10.1103/PhysRevX.12.011017
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Publication Type: 
Article - Original Research Article
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Language: 
English
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Authors: 
Takegami, D. 
Kuo, C. Y. 
Kasebayashi, K. 
Kim, J. G. 
Chang, C. F. 
Liu, C. E. 
Wu, C. N. 
Kasinathan, D. 
Altendorf, S. G. 
Hoefer, K. 
Meneghin, F. 
Marino, A. 
Liao, Y. F. 
Tsuei, K. D. 
Chen, C. T. 
Ko, K. T. 
Günther, A. 
Ebbinghaus, S. G. 
Seo, J. W. 
Lee, D. H. 
Ryu, G. 
Komarek, A. C. 
Sugano, S. 
Shimakawa, Y. 
Tanaka, A. 
Mizokawa, T. 
Kunes, Jan 
Tjeng, L. H. 
Hariki, Atsushi 
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Organisational Unit: 
E138 - Institut für Festkörperphysik 
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Journal: 
Physical Review X 
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ISSN: 
2160-3308
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Date (published): 
26-Jan-2022
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Publisher: 
AMER PHYSICAL SOC
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Peer reviewed: 
Yes
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Keywords: 
Kondo effect
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Abstract: 
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.
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Research Areas: 
Materials Characterization: 70%
Computational Materials Science: 30%
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Science Branch: 
1030 - Physik, Astronomie: 100%
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