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Magnetic fluctuations and superconducting properties of CaKFe4As4 studied by As75 NMR
Physical review B
We report ^75As nuclear magnetic resonance (NMR) studies on a new iron-based superconductor CaKFe_4As_4 with T_ c = 35 K. ^75As NMR spectra show two distinct lines corresponding to the As(1) and As(2) sites close to the K and Ca layers, respectively, revealing that K and Ca layers are well ordered without site inversions. We found that nuclear quadrupole frequencies ν_ Q of the As(1) and As(2) sites show an opposite temperature (T) dependence. Nearly T independent behavior of the Knight shiftsdoi:10.1103/physrevb.96.104512 fatcat:m2wtmmdpznev5mfgs4nms4amje