| Autor: |
Gumeniuk, R., Schöneich, M., Ruck, M., Grin, Yu., Leithe-Jasper, A., Schnelle, W., Nicklas, M., Rosner, H., Ormeci, A., Burkhardt, U., Schmidt, Marcus, Schwarz, U. |
| Jazyk: |
angličtina |
| Rok vydání: |
2010 |
| Předmět: |
|
| Zdroj: |
New journal of physics 12(10), 103035 (2010). doi:10.1088/1367-2630/12/10/103035 |
| DOI: |
10.1088/1367-2630/12/10/103035 |
| Popis: |
Ternary samarium-filled platinum–germanium skutterudite $SmPt_{4}Ge_{12}$ 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 $LaFe_4P_{12}$. X-ray absorption spectroscopy measurements show that samarium in $SmPt_{4}Ge_{12}$ 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 $LaPt_4Ge_{12}$. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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