超导电性
凝聚态物理
磷化物
联轴节(管道)
三元运算
物理
材料科学
金属
计算机科学
冶金
程序设计语言
作者
T. Takayama,K. Kuwano,Daigorou Hirai,Yukari Katsura,Atsushi Yamamoto,H. Takagi
标识
DOI:10.1103/physrevlett.108.237001
摘要
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.
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