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Superconductivity in the Platinum Germanides<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>MPt</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>M</mml:mi><mml:mo>=</mml:mo><mml:mtext mathvariant="normal">Rare</mml:mtext><mml:mtext mathvariant="normal">−</mml:mtext><mml:mtext mathvariant="normal">Earth</mml:mtext…
New germanium-platinum compounds with the filled-skutterudite crystal structure were synthesized. 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 ${\mathrm{LaPt}}_{4}{\mathrm{Ge}}_{12}$ and ${\mathrm{PrPt}}_{4}{\mathrm{Ge}}_{12}$ below 8.3 K. The parameters of the normal and superconducting states were established. …