We report on muon spin rotation/relaxation and 119Sn nuclear magnetic resonance (NMR) measurements to study the microscopic superconducting and magnetic properties of the Heusler compound with the highest superconducting transition temperature, \ypd\ (Tc=5.4 K). Measurements in the vortex state provide the temperature dependence of the effective magnetic penetration depth λ(T) and the field dependence of the superconducting gap Δ(0). The results are consistent with a very dirty s-wave BCS superconductor with a gap Δ(0)=0.85(3) meV, λ(0)=212(1) nm, and a Ginzburg-Landau coherence length ξGL(0)≅23 nm. In spite of its very dirty character, the effective density of condensed charge carriers is high compared to the normal state. The \mSR data in a broad range of applied fields are well reproduced by taking into account a field-related reduction of the effective superconducting gap. Zero-field \mSR measurements, sensitive to the possible presence of very small magnetic moments, do not show any indications of magnetism in this compound.
@article{arxiv.1307.6386,
title = {{\mu}SR and NMR study of the superconducting Heusler compound YPd2Sn},
author = {H. Saadaoui and T. Shiroka and A. Amato and C. Baines and H. Luetkens and E. Pomjakushina and V. Pomjakushin and J. Mesot and M. Pikulski and E. Morenzoni},
journal= {arXiv preprint arXiv:1307.6386},
year = {2014}
}