2022/03/18 by Hiroki Fujibayashi, Genki Nakamine, Katsuki Kinjo +11 · 1 citation
Physics and Astronomy · #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.7566/jpsj.91.043705
published as J. Phys. Soc. Jpn. 91, 043705 (2022) · 6 pages, 8 figures
arxiv created 2022/03/18 · arxiv updated 2022/03/21
This study investigates the spin susceptibility in U-based superconductor UTe2 in the superconducting (SC) state by using Knight shift measurements for a magnetic field H along the a axis, which is the magnetic easy axis of UTe2. Although a tiny anomaly ascribed to the SC diamagnetic effect was observed just below the SC transition temperature T\rm c, the a-axis Knight shift in the SC state shows no significant decrease, following the extrapolation from the normal-state temperature dependence. This indicates that the spin susceptibility is nearly unchanged below T\rm c. Considering the previous Knight shift results for H ∥ b and H ∥ c, the dominant SC state is determined to be B\rm 3u in the spin-triplet pairing, which is consistent with the spin anisotropy in the normal state. The present result shows that UTe2 is a spin-triplet superconductor with spin degrees of freedom.