Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 36: Superconductivity: Properties, Electronic Structure, Order Parameter

TT 36.6: Talk

Friday, February 29, 2008, 11:45–12:00, H 0104

Superconductivity in the new filled skutterudites MPt₄Ge₁₂ (M = La, Pr, Sr, Ba) — •Walter Schnelle, Roman Gumeniuk, Helge Rosner, Michael Nicklas, Andreas Leithe-Jasper, and Yuri Grin — Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany

New germanium-platinum compounds with the filled-skutterudite crystal structure were synthesized [1]. The crystal structure and composition were investigated by X-ray diffraction and microprobe analysis. Magnetic susceptibility, specific heat, and electrical resistivity measurements evidence superconductivity in LaPt₄Ge₁₂ and PrPt₄Ge₁₂ below 8.3 K. The parameters of the normal and superconducting states were established. Strong coupling and a crystal electric field singlet groundstate is found for the Pr compound. Electronic structure calculations show a large density of states at the Fermi level [1]. Similar behavior albeit with lower T_c was observed for SrPt₄Ge₁₂ and BaPt₄Ge₁₂ [1,2].

[1] R. Gumeniuk et al. Phys. Rev. Lett. submitted. ArXiV 0710.1413v1.

[2] R. Gumeniuk et al. Poster, this conference.