High-pressure synthesis and exotic heavy-fermion behaviour of the filled skutterudite SmPt4Ge12

被引：23

作者：

Gumeniuk, R. ^{[1
]}

Schoeneich, M. ^{[2
]}

Leithe-Jasper, A. ^{[1
]}

Schnelle, W. ^{[1
]}

Nicklas, M. ^{[1
]}

Rosner, H. ^{[1
]}

Ormeci, A. ^{[1
]}

Burkhardt, U. ^{[1
]}

Schmidt, M. ^{[1
]}

Schwarz, U. ^{[1
]}

Ruck, M. ^{[2
]}

Grin, Yu ^{[1
]}

机构：

[1] Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany

[2] Tech Univ Dresden, D-01062 Dresden, Germany

来源：

NEW JOURNAL OF PHYSICS | 2010年 / 12卷

关键词：

MAGNETIC-PROPERTIES; LN; REPRESENTATION; HO;

D O I：

10.1088/1367-2630/12/10/103035

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Ternary samarium-filled platinum-germanium skutterudite SmPt4Ge12 was prepared at a pressure of 5.0(0.5)GPa and a temperature of 1070(70) K. The compound crystallizes in the cubic space group Im (3) over bar (a = 8.6069(4)angstrom) and is isotypic with LaFe4P12. X-ray absorption spectroscopy measurements show that samarium in SmPt4Ge12 has a temperature-independent intermediate valence (v=2.90 +/- 0.03). Magnetization data reveal Van Vleck paramagnetism above similar to 50 K. The low-temperature specific heat displays a broad anomaly centred at 2.9K and a large linear coefficient gamma'=450 mJ mol(-1) K-2 suggesting heavy-fermion behaviour. Low-temperature electrical resistivity shows a temperature dependence reminiscent of the Kondo effect. Density functional calculations result in an electronic structure that is, apart from the Sm 4 f contributions, very similar to LaPt4Ge12.

引用

页数：16

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