Superconductivity in the New Platinum Germanides MPt4Ge12 (M = Rare-earth and Alkaline-earth Metals) with Filled Skutterudite Structure

Abstract

New germanium-platinum compounds with the filled-skutterudite crystal structure were synthesized. The 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 8.3K. 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. Similar behavior with lower T_c was observed for SrPt4Ge12 and BaPt4Ge12.

RevTeX, 4 figures, submitted to Physical Review Letters July 12, 2007

References in corpus (2)

• Superconductivity in novel Ge-based skutterudites: {Sr,Ba}Pt_4Ge_{12}
• Superconducting properties of Pr-based Filled skutterudite PrRu${}_4$As${}_{12}$

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• Magnetic order in the filled skutterudites RPt4Ge12 (R = Nd, Eu)
• Pressure-enhanced superconductivity in cage-type quasiskutterudite Sc5Rh6Sn18 single crystal
• Superconducting parameters of BaPt(4-x)Au(x)Ge12 filled skutterudite
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• Grüneisen rule in cubic rare-earth cage systems : the examples of LaB${}_6$ and LaPt${}_4$Ge${}_{12}$