Electronic structure of CaCu3 Ru4 O12 studied by x-ray photoemission spectroscopy

T. T. Tran*, K. Takubo, T. Mizokawa, W. Kobayashi, I. Terasaki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


We have studied the electronic structure of the d -electron heavy-fermion system CaCu3 Ru4 O12 using x-ray photoemission spectroscopy and a cluster model calculation. The Ru 3d core level spectrum shows a double-peak structure as commonly observed in metallic Ru oxides. In CaCu3 Ru4 O12, the well-screened peak has dominating intensity, indicating that the Ru 4d electrons in CaCu3 Ru4 O12 are highly itinerant. On the other hand, the Cu 2 p3 2 core level peak is accompanied by a satellite and shows that the valence state of Cu is close to 3 d9 (Cu2+) with localized character. In addition, the main Cu 2 p3 2 peak shows an asymmetric line shape due to the screening effect, suggesting the hybridization effect between the Cu 3d and Ru 4d orbitals. The present results show that, among the d -electron heavy-fermion materials, the electronic structure of CaCu3 Ru4 O12 best resembles that of the f -electron Kondo system.

Original languageEnglish
Article number193105
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number19
Publication statusPublished - 2006
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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