Pressure-Temperature Phase Diagram of Sm Valence State in a Heavy Fermion Compound SmOs4Sb12

被引：8

作者：

Tsutsui, Satoshi ^{[1
]}

Kawamura, Naomi ^{[1
]}

Mizumaki, Masaichiro ^{[1
]}

Ishimatsu, Naoki ^{[2
]}

Maruyama, Hiroshi ^{[2
]}

Sugawara, Hitoshi ^{[3
]}

Sato, Hideyuki ^{[4
]}

机构：

[1] SPring 8, Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6785198, Japan

[2] Hiroshima Univ, Grad Sch Sci, Hiroshima 7398526, Japan

[3] Kobe Univ, Grad Sch Sci, Kobe, Hyogo 6578501, Japan

[4] Tokyo Metropolitan Univ, Dept Phys, Hachioji, Tokyo 1920397, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2013年 / 82卷 / 02期

关键词：

valence fluctuation; heavy fermion; quantum criticality; X-ray absorption spectroscopy; filled skutterudite; SmOs4Sb12; BEHAVIOR; CEOS4SB12;

D O I：

10.7566/JPSJ.82.023707

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

For the unconventional heavy fermion compound SmOs4Sb12, the temperature dependence of the Sm valence state was investigated by Sm L-m-edge X-ray absorption spectroscopy under the application of pressure. The Sm valence was found to fluctuate up to a pressure of 3.5 GPa. From the pressure and temperature dependence of the average Sm valence, it was concluded that the Sm divalent contribution plays an important role in the heavy fermion behavior of SmOs4Sb12. Pressure dependence of a characteristic temperature in the Sm valence states exhibits a minimum at around 1 GPa. This finding demonstrates the correlation between the Sm valence and heavy fermion behavior in SmOs4Sb12.

引用

页数：4

共 29 条

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