Anomalous duality of 4f electrons in filled skutterudite CeOs4Sb12

M. Matsunami, R. Eguchi, T. Kiss, K. Horiba, A. Chainani, M. Taguchi, K. Yamamoto, T. Togashi, S. Watanabe, X. Y. Wang, C. T. Chen, Y. Senba, H. Ohashi, H. Sugawara, H. Sato, H. Harima, S. Shin

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Abstract

We study the electronic structure of the filled skutterudite CeOs4Sb12 using photoemission spectroscopy (PES). Soft x-ray excited Ce 3d-4f resonant PES confirms the existence of Ce 4f states at the Fermi level (EF). Temperature dependent high-resolution laser-PES spectra reveal a pseudogap formation around EF, which can be explained in terms of the hybridization gap. Simultaneously, a sharp feature is formed just above EF with decreasing temperature. The heavy-fermion-like specific heat is attributed to the occupation of this feature. The results identify the origin of the anomalous coexistence of heavy-fermion and pseudogap behavior in terms of a symmetry dependent hybridization.

Original languageEnglish
Article number036403
JournalPhysical Review Letters
Volume102
Issue number3
DOIs
Publication statusPublished - Jan 20 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Matsunami, M., Eguchi, R., Kiss, T., Horiba, K., Chainani, A., Taguchi, M., Yamamoto, K., Togashi, T., Watanabe, S., Wang, X. Y., Chen, C. T., Senba, Y., Ohashi, H., Sugawara, H., Sato, H., Harima, H., & Shin, S. (2009). Anomalous duality of 4f electrons in filled skutterudite CeOs4Sb12. Physical Review Letters, 102(3), [036403]. https://doi.org/10.1103/PhysRevLett.102.036403