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The relationship between charge density wave (CDW) orders andsuperconductivity in arsenide superconductor SrPt$_2$As$_2$ with $T_c$ = 5.2 Kwhich crystallizes in the CaBe$_2$Ge$_2$-type structure was studied by$^{75}$As nuclear magnetic resonance (NMR) measurements up to 520 K, and$^{75}$As nuclear quadrupole resonance (NQR) and $^{195}$Pt-NMR measurementsdown to 1.5 K. At high temperature, $^{75}$As-NMR spectrum and nuclear spinrelaxation rate ($1/T_1$) have revealed two distinct CDW orders, one realizedin the As-Pt-As layer below $T_{\rm CDW}^{\rm As(1)}$ $=$ 410 K and the otherin the Pt-As-Pt layer below $T_{\rm CDW}^{\rm As(2)}$ $=$ 255 K. The $1/T_1$measured by $^{75}$As-NQR shows a clear Hebel-Slichter peak just below $T_c$and decreases exponentially well below $T_c$. Concomitantly, $^{195}$Pt Knightshift decreases below $T_c$. Our results indicate that superconductivity inSrPt$_2$As$_2$ is in the spin-singlet state with an $s$-wave gap and is robustunder the two distinct CDW orders in different layers.

Coexistence of multiple charge-density waves and superconductivity in SrPt2As2 revealed by 75As-NMR/NQR and 195Pt-NMR