DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2011 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.12: Poster

Thursday, March 17, 2011, 10:00–13:00, P1

Exotic Heavy-Fermion Behaviour of the Filled Skutterudite SmPt4Ge12 — •Roman Gumeniuk1, Walter Schnelle1, Michael Nicklas1, Helge Rosner1, Michael Schöneich2, and Andreas Leithe-Jasper11MPI Chemische Physik fester Stoffe, Dresden — 2Anorganische Chemie, TU Dresden

Samarium-filled platinum-germanium skutterudite SmPt4Ge12 was prepared at high pressure and temperature (5.0 GPa, 1070 K). The compound is isotypic with LaFe4P12 (cubic, space group Im3, a = 8.6069(4) Å). X-ray absorption spectroscopy measurements show that samarium in SmPt4Ge12 has a temperature-independent intermediate valence (ν = 2.90 ± 0.03). Van-Vleck paramagnetism is observed above ∼50 K. The low-temperature specific heat displays a broad anomaly around at 2.9 K and a large linear coefficient γ′ = 450 mJ mol−1K−2 suggesting heavy-fermion behaviour. 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.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2011 > Dresden