2012/05/08 by T. Takayama, Takayama, T., K. Kuwano +12
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con) #Thermal Expansion and Ionic Conductivity #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.1205.1589
Accepted for publication in Phys. Rev. Lett
arxiv created 2012/05/08 · openalex publication_date 2012/05/08 · arxiv updated 2012/05/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 D0 and Tc, 2D0/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.