Coexistence of strongly mixed-valence and heavy-fermion character in SmOs4Sb12 studied by soft- and hard-X-ray spectroscopy.

Yamasaki, A; Imada, S; Higashimichi, H; Fujiwara, H; Saita, T; Miyamachi, T; Sekiyama, A; Sugawara, H; Kikuchi, D; Sato, H; Higashiya, A; Yabashi, M; Tamasaku, K; Miwa, D; Ishikawa, T; Suga, S

Yamasaki, A; Imada, S; Higashimichi, H; Fujiwara, H; Saita, T; Miyamachi, T; Sekiyama, A; Sugawara, H; Kikuchi, D; Sato, H; Higashiya, A; Yabashi, M; Tamasaku, K; Miwa, D; Ishikawa, T; Suga, S.

Afiliación

Yamasaki A; Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.

Phys Rev Lett ; 98(15): 156402, 2007 Apr 13.

Article en En | MEDLINE | ID: mdl-17501367

RESUMEN

Sm-based heavy-fermion compound SmOs4Sb12 has been investigated by soft x-ray (hnu=1070-1600 eV) and hard x-ray (HX; hnu=7932 eV) spectroscopy. The HX photoemission spectroscopy clearly demonstrates that the strongly mixed-valence state and the heavy-fermion state coexist in the bulk. It is found that the Sm valence decreases below 100 K, indicating that the Kondo coherence develops with approaching the proposed Kondo temperature. Our theoretical analyses suggest that the origin of the coexistence in SmOs4Sb12 is the coincidence of two conditions, namely, (i) the energy difference between Sm divalent and trivalent states is very small and (ii) the hybridization between Sm 4f and conduction electrons is weak.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2007 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos

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