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We report 75As-nuclear magnetic resonance (NMR) and nuclear quadrupoleresonance (NQR) measurements on transition-metal arsenides LaRu2As2,KCa2Fe4As4F2, and A2Cr3As3. In the superconducting state of LaRu2As2, a Hebel-Slichter coherence peak is found in the temperature dependence of thespin-lattice relaxation rate-1/T1 just below Tc, which indicates that LaRu2As2is a full-gap superperconducor. For KCa2Fe4As4F2, antiferromagnetic spinfluctuations are observed in the normal state. We further find that theanisotropy rate RAF = Tc1/Tab1 is small and temperature independent, implyingthat the low energy spin fluctuations are isotropic in spin space. Our resultsindicate that KCa2Fe4As4F2 is a moderately overdoped iron-arsenidehigh-temperature superconductor with a stoichiometric composition. ForA2Cr3As3, we calculate the electric field gradient by first-principle methodand assign the 75As-NQR peaks with two crystallographically different As sites,paving the way for further NMR investigation.

NMR and NQR studies on transition-metal arsenide superconductors LaRu2As2, KCa2Fe4As4F2, and A2Cr3As3