Abstract
We report a study of the normal- and superconducting-state electronic properties of the centrosymmetric compound ${\mathrm{SrPt}}_{3}\mathrm{P}$ via $^{31}\mathrm{P}$ nuclear-magnetic-resonance (NMR) and magnetometry investigations. Essential features such as a sharp drop of the Knight shift at $T<{T}_{c}$ and an exponential decrease of the NMR spin-lattice relaxation ratio $1/({T}_{1}T)$ below ${T}_{c}$ are consistent with an $s$-wave electron pairing in ${\mathrm{SrPt}}_{3}\mathrm{P}$, although a direct confirmation in the form of a Hebel-Slichter-type peak is lacking. Normal-state NMR data at $T<50$ K indicate conventional features of the conduction electrons, typical of simple metals such as lithium or silver. Our data are finally compared with available NMR results for the noncentrosymmetric superconductors ${\mathrm{LaPt}}_{3}\mathrm{Si}$ and ${\mathrm{CePt}}_{3}\mathrm{Si}$, which adopt similar crystal structures.
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