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Shiki Ogata,Shunsaku Kitagawa,Mayu Kibune,Kenji Ishida,Katsuki Kinjo,Manuel Brando,Christoph Geibel,Seunghyun Khim,Elena Hassinger 한국물리학회 2023 새물리 Vol.73 No.12
We performed <SUP>75</SUP>As-NMR measurements in H k ab to investigate the normal-state magnetic properties of CeRh₂As₂, a recently-discovered heavy-fermion superconductor. We compared the NMR Knight shift K with the magnetic susceptibility χ<SUP>ab</SUP>, and estimated the hyperfine coupling constant Ahf from the slope of the K - χ plot. We observed that the magnitude of A<SUB>hf;ab</SUB> at the As(1) site changes at around 20 K owing to emerging the heavy-fermion state, which was also observed in Ahf at the As(2) site and in H || c. The sign of A<SUB>hf;ab</SUB> at the As(1) site is negative in low temperature. These are important for the analysis of the NMR results of CeRh₂As₂ in the superconducting state.