TY - JOUR
T1 - Superconducting Order Parameter in UTe2 Determined by Knight Shift Measurement
AU - Fujibayashi, Hiroki
AU - Nakamine, Genki
AU - Kinjo, Katsuki
AU - Kitagawa, Shunsaku
AU - Ishida, Kenji
AU - Tokunaga, Yo
AU - Sakai, Hironori
AU - Kambe, Shinsaku
AU - Nakamura, Ai
AU - Shimizu, Yusei
AU - Homma, Yoshiya
AU - Li, Dexin
AU - Honda, Fuminori
AU - Aoki, Dai
N1 - Funding Information:
Acknowledgments The authors would like to thank J. Ishizuka, Y. Yanase, K. Machida, S. Fujimoto, V. P. Mineev, Y. Maeno, S. Yonezawa, J.-P. Brison, G. Knebel, and J. Flouquet for their valuable inputs in our discussions. This work was supported by the Kyoto University LTM Center, Grants-in-Aid for Scientific Research (Grant Nos. JP15H05745, JP17K14339, JP19K03726, JP16KK0106, JP19K14657, JP19H04696, JP19H00646, JP20H00130, and JP20KK0061).
Publisher Copyright:
© 2022 The Physical Society of Japan
PY - 2022/4/15
Y1 - 2022/4/15
N2 - 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 Tc, 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 Tc. Considering the previous Knight shift results for H ∥ b and H ∥ c, the dominant SC state is determined to be B3u 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.
AB - 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 Tc, 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 Tc. Considering the previous Knight shift results for H ∥ b and H ∥ c, the dominant SC state is determined to be B3u 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.
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U2 - 10.7566/JPSJ.91.043705
DO - 10.7566/JPSJ.91.043705
M3 - Article
AN - SCOPUS:85126526196
SN - 0031-9015
VL - 91
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 4
M1 - 043705
ER -