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We report a study of the normal- and superconducting-state electronicproperties of the centrosymmetric compound SrPt3P via 31Pnuclear-magnetic-resonance (NMR) and magnetometry investigations. Essentialfeatures such as a sharp drop of the Knight shift at T < Tc and an exponentialdecrease of the NMR spin-lattice relaxation ratio 1/(T1T) below Tc areconsistent with an s-wave electron pairing in SrPt3P, although a directconfirmation in the form of a Hebel-Slichter-type peak is lacking. Normal-stateNMR data at T < 50 K indicate conventional features of the conductionelectrons, typical of simple metals such as lithium or silver. Our data arefinally compared with available NMR results for the noncentrosymmetricsuperconductors LaPt$_3$Si and CePt$_3$Si, which adopt similar crystalstructures.

Pairing of weakly correlated electrons in the platinum-based centrosymmetric superconductor SrPt3P