Coexistence of Strongly Mixed-Valence and Heavy-Fermion Character <?format ?>in Studied by Soft- and Hard-X-Ray Spectroscopy
A Yamasaki, S Imada, H Higashimichi, H Fujiwara… - Physical review …, 2007 - APS
A Yamasaki, S Imada, H Higashimichi, H Fujiwara, T Saita, T Miyamachi, A Sekiyama…
Physical review letters, 2007•APSSm-based heavy-fermion compound SmOs 4 Sb 12 has been investigated by soft x-ray (h ν=
1070–1600 eV) and hard x-ray (HX; h ν= 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 SmOs 4 …
1070–1600 eV) and hard x-ray (HX; h ν= 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 SmOs 4 …
Sm-based heavy-fermion compound has been investigated by soft x-ray () and hard x-ray (HX; ) 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 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 and conduction electrons is weak.
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