@article{2f0c5202a06844708d069317b519c29a,
title = "CaCu3Ru4 O12: A High-Kondo-Temperature Transition-Metal Oxide",
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.",
author = "D. Takegami and Kuo, {C. Y.} and K. Kasebayashi and Kim, {J. G.} and Chang, {C. F.} and Liu, {C. E.} and Wu, {C. N.} and D. Kasinathan and Altendorf, {S. G.} and K. Hoefer and F. Meneghin and A. Marino and Liao, {Y. F.} and Tsuei, {K. D.} and Chen, {C. T.} and Ko, {K. T.} and A. G{\"u}nther and Ebbinghaus, {S. G.} and Seo, {J. W.} and Lee, {D. H.} and G. Ryu and Komarek, {A. C.} and S. Sugano and Y. Shimakawa and A. Tanaka and T. Mizokawa and J. Kune{\v s} and Tjeng, {L. H.} and A. Hariki",
note = "Funding Information: The authors thank Sebastian Huber for discussions and benchmark NRG calculations, and Andrii Sotnikov for discussions in the early stage of this work. A. H. and J. K. are supported by the European Research Council (ERC) under the European Union{\textquoteright}s Horizon 2020 research and innovation program (Grant Agreement No. 646807-EXMAG). A. H. was supported by JSPS KAKENHI Grant No. 21K13884. The computations were performed at the Vienna Scientific Cluster (VSC). The research in Dresden is supported by the Deutsche Forschungsgemeinschaft (DFG) through Grant No. 320571839 and SFB 1143 (Project-ID No. 247310070). The experiments in Taiwan and Korea were facilitated by the Max Planck-POSTECH-Hsinchu Center for Complex Phase Materials. K. K. and K.-T. K. were supported by National Research Foundation of Korea (NRF) through the Max Planck-POSTECH Initiative (No. 2016K1A4A4A01922028). S. S. and Y. S. are supported by JSPS KAKENHI Grants-in-Aid for Scientific Research (No. 19H05823 and No. 20H00397) and by a JSPS Core-to-Core Program (A) Advanced Research Networks. Publisher Copyright: {\textcopyright} 2022 authors. Published by the American Physical Society.",
year = "2022",
month = mar,
doi = "10.1103/PhysRevX.12.011017",
language = "English",
volume = "12",
journal = "Physical Review X",
issn = "2160-3308",
publisher = "American Physical Society",
number = "1",
}