Investigation of the hyperfine coupling constant of locally noncentrosymmetric heavy-fermion superconductor CeRh${}_2$As${}_2$

Abstract

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 of $A_{\mathrm{hf},ab}$ at the As(1) site changes at around 20 K owing to emerging the heavy-fermion state, which was also observed in $A_{\mathrm{hf}}$ at the As(2) site and in $H\parallel c$. The sign of $A_{\mathrm{hf},ab}$ at the As(1) site is negative in low temperature. These are important for the analysis of the NMR results of CeRh${}_2$As${}_2$ in the superconducting state.

4 pages, 3 figures, SCES2023 proceedings

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