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

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

Luo Jun^{1, ‡}, Wang Chunguang^{1, 2}, Wang Zhicheng³, Guo Qi¹, Yang Ji¹, Zhou Rui^{1, 4}, Matano K⁵, Oguchi T⁶, Ren Zhian^{1, 2}, Cao Guanghan³, Zheng Guo-Qing^{1, 2, 5, §}

(a) ⁷⁵As NQR spectra of A₂Cr₃As₃ (A = Na, Na_0.75K_0.25, K, Rb, Cs) measured at T = 150 K. The two peaks correspond to two As sites, namely, As1 site and As2 site. The data for the right peak of K₂Cr₃As₃ was referred from Ref. [28]. (b) Surrounding environments of As1 site and As2 site, respectively. (c) Temperature dependence of ν_Q normalized by its value at 4.2 K. The original data of K₂Cr₃As₃ and Cs₂Cr₃As₃ were referred from Refs. [28,63].