Investigation of the hyperfine coupling constant of locally noncentrosymmetric heavy-fermion superconductor CeRh_2As_2
arxiv(2024)
摘要
We performed ^75As-NMR measurements in H∥ ab to investigate the
normal-state magnetic properties of CeRh_2As_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_2As_2 in the
superconducting state.
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