Two-Dimensional XY-Type Magnetic Properties of Locally Noncentrosymmetric Superconductor CeRh2As2

Shunsaku Kitagawa, Mayu Kibune, Katsuki Kinjo, Masahiro Manago, Takanori Taniguchi, Kenji Ishida, Manuel Brando, Elena Hassinger, Christoph Geibel, Seunghyun Khim
2022 Journal of the Physical Society of Japan  
We performed ^75As-NMR measurements to investigate the normal-state magnetic properties of CeRh_2As_2, a recently-discovered heavy-fermion superconductor. The magnitude and temperature dependence of the Knight shift at the As(2) site indicate easy-plane-type magnetic anisotropy in CeRh_2As_2. With regard to spin fluctuations, the temperature dependence of the nuclear spin-lattice relaxation rate 1/T_1 arising from the 4f electrons decreases from high-temperature constant behavior on cooling at
more » ... 40 K, which is typical behavior of heavy-fermion systems. In addition, 1/T_1 becomes constant at low temperatures, suggesting spatially two-dimensional antiferromagnetic fluctuations. Two-dimensional magnetic correlations in the real space are quite rare among heavy-fermion superconductors, and they may be a key factor in the unique superconducting multi-phase in CeRh_2As_2.
doi:10.7566/jpsj.91.043702 fatcat:g5arlmchijdurcfxrdxuik3zuu