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Investigation of the Hyperfine Coupling Constant of Locally Noncentrosymmetric Heavy-fermion Superconductor CeRh<sub>2</sub>As<sub>2</sub>
We performed $^{75}$As-NMR measurements in $H\parallel ab$ to investigate the normal-state magnetic properties of CeRh$_2$As$_2$, a recently-discovered heavy-fermion superconductor. We compared the NMR Knight shift $K$ with the magnetic susceptibility $\chi_{ab}$, and estimated the hyperfine coupling constant $A_{\mathrm{hf}}$ from the slope of the $K-\chi$ plot. We observed that the magnitude …