TY - JOUR
T1 - Drastic change in magnetic anisotropy of UTe2 under pressure revealed by Te 125 -NMR
AU - Kinjo, Katsuki
AU - Fujibayashi, Hiroki
AU - Nakamine, Genki
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:
The authors would like to thank M. Manago, J. Ishizuka, Y. Yanase, Y. Maeno, S. Yonezawa, J-P. Brison, G. Knebel, and J. Flouquet for valuable discussions, and Editage for English language editing. This work was supported by the Kyoto University LTM Center, Grants-in-Aid for Scientific Research (Grants No. JP15H05745, No. JP17K14339, No. JP19K03726, No. JP16KK0106, No. JP19K14657, No. JP19H04696, No. JP19H00646, No. JP20H00130, and No. JP20KK0061), and a Grant-in-Aid for JSPS Research Fellows (Grant No. JP20J11939) from JSPS.
Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - To investigate the normal-state magnetic properties of UTe2 under pressure, we perform Te125 nuclear magnetic resonance (NMR) measurements up to 2 GPa. Below 1.2 GPa, the b-axis NMR Knight shift shows a broad maximum at the so-called Tχmax on cooling, which is consistent with the magnetization measurement under pressure. Tχmax decreases with increasing pressure and disappears at the critical pressure Pc = 1.7 GPa, above which superconductivity is destroyed. This tendency is also observed in the temperature dependence of the nuclear spin-lattice relaxation rate 1/T1. At low pressures, 1/T1 shows a conventional Fermi-liquid behavior (1/T1T=const) at low temperatures, indicating the formation of the heavy-fermion state. Above Pc, 1/T1T follows a 1/T behavior without any crossover to the heavy-fermion state down to the lowest temperature (∼3 K). In addition, the NMR signals disappear below 3 K, due to the influence of the magnetically ordered moments. From the pressure dependence of the Tχmax and Knight shift, it was found that the Fermi surface character is abruptly changed at Pc, and that superconductivity is observed only in the heavy-fermion state.
AB - To investigate the normal-state magnetic properties of UTe2 under pressure, we perform Te125 nuclear magnetic resonance (NMR) measurements up to 2 GPa. Below 1.2 GPa, the b-axis NMR Knight shift shows a broad maximum at the so-called Tχmax on cooling, which is consistent with the magnetization measurement under pressure. Tχmax decreases with increasing pressure and disappears at the critical pressure Pc = 1.7 GPa, above which superconductivity is destroyed. This tendency is also observed in the temperature dependence of the nuclear spin-lattice relaxation rate 1/T1. At low pressures, 1/T1 shows a conventional Fermi-liquid behavior (1/T1T=const) at low temperatures, indicating the formation of the heavy-fermion state. Above Pc, 1/T1T follows a 1/T behavior without any crossover to the heavy-fermion state down to the lowest temperature (∼3 K). In addition, the NMR signals disappear below 3 K, due to the influence of the magnetically ordered moments. From the pressure dependence of the Tχmax and Knight shift, it was found that the Fermi surface character is abruptly changed at Pc, and that superconductivity is observed only in the heavy-fermion state.
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U2 - 10.1103/PhysRevB.105.L140502
DO - 10.1103/PhysRevB.105.L140502
M3 - Article
AN - SCOPUS:85128429190
SN - 2469-9950
VL - 105
JO - Physical Review B
JF - Physical Review B
IS - 14
M1 - L140502
ER -