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 NMR spectrum of LaRu₂As₂ at T = 5 K and H₀ = 12.951 T. There are two satellite peaks. The central transition frequency ν_res has two peaks with θ = 42° and θ = 90° due to the second order perturbation. The dashed line corresponds to K = 0. (b) ⁷⁵As NQR spectrum of LaRu₂As₂ at T = 8 K. The curve is Gaussian fitting of the spectrum.