Acta Physica Polonica B

Vol. 34, No. 22, February 2003, page 1035

Heavy Fermion Behavior of Pr 4f Electrons in Filled Skutterudites Studied by Bulk-Sensitive Photoemission

A. Yamasaki, S. Imada, T. Masuda, T. Nanba, A. Sekiyama, H. Sugawara, T.D. Matsuda, H. Sato, C. Sekine, I. Shirotani, H. Harima, S. Suga

Pr 4f electronic structures in Pr-based filled skutterudites PrT4X12 (T=Fe and Ru; X=P and Sb) have been studied by the high-resolution bulk-sensitive Pr 3d\to 4f resonance photoemission spectroscopy. A very strong Pr 4f spectral intensity is observed just below the Fermi level in the heavy-Fermion PrFe4P12. This is the first observation of the Kondo resonance due to the quadrupolar Kondo effect, the origin of which is attributed to the strong hybridization between the Pr 4f and the conduction electrons.

PACS numbers: 79.60.--i, 71.20.Eh, 71.27.+a, 71.20.--b

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