Anomalous electromagnetic response in spin-triplet superconductor UTe2
Anomalous electromagnetic response in spin-triplet superconductor UTe2
复制标题
自旋三重态超导体 UTe2 中的反常电磁响应
DOI：
10.1103/physrevb.106.214525
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发表时间：
2022
影响因子：
3.7
通讯作者：
Aoki Dai
中科院分区：
文献类型：
--
作者：
Shimizu Yusei;Kittaka Shunichiro;Kono Yohei;Sakakibara Toshiro;Machida Kazushige;Nakamura Ai;Li Dexin;Homma Yoshiya;Sato Yoshiki J.;Miyake Atsushi;Yamashita Minoru;Aoki Dai
最近发现的重费米子超导体是奇宇称超导的有希望的候选者，它表现出反常磁场增强超导性，其上临界场高达 35 T。然而，这种非常规超导性的热力学性质仍然不清楚。在这里，我们提出了直流磁化和热容测量的结果，以探测低温下的磁响应。获得的超导状态下的等温磁化强度清楚地证明了反常磁通钉扎效应，这很可能与硬磁化轴（正交轴）自旋三重态配对态的特殊电磁响应有关。交流磁化率测量结果支持了异常涡旋态。我们还发现了上方的利夫希茨转变和易磁化轴（轴）的异常通量钉扎异常的证据。
The recently discovered heavy-fermion superconductor, as a promising candidate for an odd-parity superconductivity, exhibits anomalous magnetic-field reinforced superconductivity with a huge upper critical field of 35 T. However, the thermodynamic properties of this unconventional superconductivity still remain unclear. Herein we present the results of dc magnetization and heat capacity measurements into probe the magnetic response at low temperatures. The obtained isothermal magnetization in the superconducting state ofclearly demonstrates the anomalous magnetic flux pinning effect, which is most likely related to the peculiar electromagnetic response of the spin-triplet pairing state in the hard-magnetization axis (orthorhombicaxis). The ac susceptibility measurements support the anomalous vortex states in. We also found evidence for the Lifshitz transition just aboveand the anomalous flux pinning anomalies for the easy-magnetization axis (axis).