Investigation of the hyperfine coupling constant of locally noncentrosymmetric heavy-fermion superconductor CeRh$_{2}$As$_{2}$

Shiki Ogata; Shunsaku Kitagawa; Katsuki Kinjo; Mayu Kibune; Kenji Ishida; Manuel Brando; Elena Hassinger; Christoph Geibel; Seunghyun Khim

doi:10.3938/NPSM.73.1115

paper

Investigation of the hyperfine coupling constant of locally noncentrosymmetric heavy-fermion superconductor CeRh $_{2}$ As $_{2}$

arXiv:2401.13291 · doi:10.3938/NPSM.73.1115

Abstract

We performed $^{75}$ As-NMR measurements in $H ∥ ab$ 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 $χ_{ab}$ , and estimated the hyperfine coupling constant $A_{hf}$ from the slope of the $K - χ$ plot. We observed that the magnitude of $A_{hf, ab}$ at the As(1) site changes at around 20 K owing to emerging the heavy-fermion state, which was also observed in $A_{hf}$ at the As(2) site and in $H ∥ c$ . The sign of $A_{hf, ab}$ 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.

arXiv comment4 pages, 3 figures, SCES2023 proceedings

Investigation of the hyperfine coupling constant of locally noncentrosymmetric heavy-fermion superconductor CeRh2​As2​

Abstract

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Investigation of the hyperfine coupling constant of locally noncentrosymmetric heavy-fermion superconductor CeRh $_{2}$ As $_{2}$