Superconducting Properties of Heavy Fermion UTe2 Revealed by 125Te-nuclear Magnetic Resonance

被引：94

作者：

Nakamine, Genki ^{[1
]}

Kitagawa, Shunsaku ^{[1
]}

Ishida, Kenji ^{[1
]}

Tokunaga, Yo ^{[2
]}

Sakai, Hironori ^{[2
]}

Kambe, Shinsaku ^{[2
]}

Nakamura, Ai ^{[3
]}

Shimizu, Yusei ^{[3
]}

Homma, Yoshiya ^{[3
]}

Li, Dexin ^{[3
]}

Honda, Fuminori ^{[3
]}

Aoki, Dai ^{[3
,4
]}

机构：

[1] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[2] Japan Atom Energy Agcy, ASRC, Tokai, Ibaraki 3191195, Japan

[3] Tohoku Univ, IMR, Oarai, Ibaraki 3111313, Japan

[4] Univ Grenoble, CEA, IRIG PHERIQS, F-38000 Grenoble, France

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2019年 / 88卷 / 11期

关键词：

FERROMAGNETISM;

D O I：

10.7566/JPSJ.88.113703

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have performed the Te-125-nuclear magnetic resonance (NMR) measurement in the field along the b axis on the newly discovered superconductor UTe2, which is a candidate of a spin-triplet superconductor. The nuclear spin-lattice relaxation rate divided by temperature 1/T1T abruptly decreases below a superconducting (SC) transition temperature T-c without showing a coherence peak, indicative of UTe2 being an unconventional superconductor. It was found that the temperature dependence of 1/T1T in the SC state cannot be understood by a single SC gap behavior but can be explained by a two SC gap model. The Knight shift, proportional to the spin susceptibility, decreases below T-c, but the magnitude of the decrease is much smaller than the decrease expected in the spin-singlet pairing. Rather, the small Knight-shift decrease as well as the absence of the Pauli-depairing effect can be interpreted by the spin triplet scenario.

引用

页数：4

共 26 条

[1] Coexistence of superconductivity and ferromagnetism in URhGe [J].