Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.13: Poster
Montag, 31. März 2014, 15:00–19:00, P2
Strong electron-phonon coupling and the superconducting energy gap in SrPt3P — •Diego A. Zocco1, Sven Krannich1, Rolf Heid1, Klaus-Peter Bohnen1, Thomas Forrest2, Alexei Bossak2, and Frank Weber1 — 1Institute for Solid State Physics, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany. — 2European Synchrotron Radiation Facility, F-38043 Grenoble Cedex, France.
We present a study of the lattice dynamical properties of the recently discovered superconductor SrPt3P (Tc = 8.4 K) via high-resolution inelastic x-ray scattering performed on a polycrystalline sample. Previous specific-heat measurements reveal evidence for very strong coupling s-wave superconductivity (2Δ / kB Tc ∼ 5) [1], consistent with our ab initio calculations which yield a large electron-phonon coupling constant λ ∼ 2. Our data suggests that a softening of a low-energy phonon mode occurs as temperature is lowered from 300 K to 10 K. Possible effects upon entering the superconducting state will also be discussed. Our insight into the pairing mechanism in this new superconducting compound will be important for the understanding of Pt-based superconductors in general, in particular the closely related heavy-fermion non-centrosymmetric superconductor CePt3P.
T. Takayama, Phys. Rev. Lett. 108, 237001 (2012)