TY - JOUR
T1 - Strong coupling superconductivity at 8.4 K in an antiperovskite phosphide SrPt 3P
AU - Takayama, T.
AU - Kuwano, K.
AU - Hirai, D.
AU - Katsura, Y.
AU - Yamamoto, A.
AU - Takagi, H.
PY - 2012/6/8
Y1 - 2012/6/8
N2 - We report the discovery of a family of ternary platinum phosphides APt 3P (A=Ca, Sr, and La), which crystallize in an antiperovskite-based structure closely related to that of the heavy fermion superconductor CePt 3Si. All three phosphides showed superconductivity at low temperatures and the highest critical temperature T c=8.4K was observed for SrPt 3P. The analysis of specific heat C(T) for SrPt 3P shows clear evidence for very strong coupling s-wave superconductivity with a large ratio between superconducting gap Δ 0 and T c, 2Δ 0/k BT 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.
AB - We report the discovery of a family of ternary platinum phosphides APt 3P (A=Ca, Sr, and La), which crystallize in an antiperovskite-based structure closely related to that of the heavy fermion superconductor CePt 3Si. All three phosphides showed superconductivity at low temperatures and the highest critical temperature T c=8.4K was observed for SrPt 3P. The analysis of specific heat C(T) for SrPt 3P shows clear evidence for very strong coupling s-wave superconductivity with a large ratio between superconducting gap Δ 0 and T c, 2Δ 0/k BT 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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U2 - 10.1103/PhysRevLett.108.237001
DO - 10.1103/PhysRevLett.108.237001
M3 - Article
AN - SCOPUS:84862195598
SN - 0031-9007
VL - 108
JO - Physical Review Letters
JF - Physical Review Letters
IS - 23
M1 - 237001
ER -