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We report the discovery of a family of ternary platinum phosphides APt3P (A = Ca, Sr, and La), which crystallize in an antiperovskite-based structure closely related to that of the heavy fermion superconductor CePt3Si. All three phosphides showed superconductivity at low temperatures and the highest critical temperature T(c) = 8.4  K was observed for SrPt3P. The analysis of specific heat C(T) for SrPt3P shows clear evidence for very strong coupling s-wave superconductivity with a large ratio between superconducting gap Δ0 and T(c), 2Δ0/k(B)T(c) ∼ 5, and the presence of low-energy phonons. The presence of multiple Fermi surface pockets was inferred from the nonlinear magnetic field dependence of Hall resistivity, which we argue might play a role in realizing the strong coupling of charge carriers with the low-lying phonons.

physical review letters

Strong Coupling Superconductivity at 8.4 K in an Antiperovskite Phosphide<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Sr</mml:mi><mml:msub><mml:mi>Pt</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="bold">P</mml:mi></mml:math>

Strong Coupling Superconductivity at 8.4 K in an Antiperovskite PhosphideSrPt3P