Investigation of the Hyperfine Coupling Constant of Locally Noncentrosymmetric Heavy-fermion Superconductor CeRh₂As₂

Shiki Ogata, Shunsaku Kitagawa, Mayu Kibune, K. Ishida, Katsuki Kinjo, M. Brando, C. Geibel, Seunghyun Khim, Elena Hassinger

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.

Locations

• New Physics Sae Mulli - View
• arXiv (Cornell University) - View - PDF
• DataCite API - View