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

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

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12j3035g&link_type=abstract

New Journal of Physics, Volume 12, Issue 10, pp. 103035 (2010).

Physics

2

Scientific paper

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\bar{3} (a=8.6069(4) Å) and is isotypic with LaFe4P12. X-ray absorption spectroscopy measurements show that samarium in SmPt4Ge12 has a temperature-independent intermediate valence (ν=2.90±0.03). Magnetization data reveal Van Vleck paramagnetism above ~50 K. The low-temperature specific heat displays a broad anomaly centred at 2.9 K and a large linear coefficient γ ' =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 4f contributions, very similar to LaPt4Ge12.

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