Strong Coupling Superconductivity at 8.4 K in an Antiperovskite Phosphide SrPt3P

T. Takayama; K. Kuwano; D. Hirai; Y. Katsura; A. Yamamoto; H. Takagi

doi:10.1103/PhysRevLett.108.237001

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Strong Coupling Superconductivity at 8.4 K in an Antiperovskite Phosphide SrPt3P

T. Takayama, K. Kuwano, D. Hirai, Y. Katsura, A. Yamamoto, H. Takagi

DOI 10.1103/PhysRevLett.108.237001 · Physical Review Letters

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Abstract

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 Tc=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 Tc, 2Δ0/kBTc∼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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
SrPt3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.4	Pressure not reported	onset
SrPt3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.4	Pressure not reported	onset
SrPt3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.4	Pressure not reported	midpoint
CaPt3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.6	Pressure not reported	unknown
CaPt3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.6	Pressure not reported	unknown
LaPt3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.5	Pressure not reported	unknown
LaPt3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.5	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown
LaPt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.6	Pressure not reported	unknown