Chiral superconductivity in UTe(2) probed by anisotropic low-energy excitations.
Chiral superconductivity in UTe(2) probed by anisotropic low-energy excitations.
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DOI：
10.1038/s41467-023-38688-y
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发表时间：
2023-05-23
影响因子：
16.6
通讯作者：
Shibauchi, Takasada
中科院分区：
文献类型：
--
作者：
Ishihara, Kota;Roppongi, Masaki;Kobayashi, Masayuki;Imamura, Kumpei;Mizukami, Yuta;Sakai, Hironori;Opletal, Petr;Tokiwa, Yoshifumi;Haga, Yoshinori;Hashimoto, Kenichiro;Shibauchi, Takasada
手性自旋三重态超导是一种具有破缺时间反转对称性的拓扑非平凡配对态，可以承载马约拉纳准粒子。重费米子超导体UTe2表现出特殊的自旋三重态配对性质，并积极讨论了其可能的手性态。然而，决定马约拉纳表面态的序参量的对称性和节点结构仍存在争议。本文重点研究了UTe2基态超导隙节点的数目和位置。我们对三种晶体中三种场取向的磁穿透深度测量结果都显示出温度的幂律依赖关系，指数接近2，这排除了单组分自旋三重态。低能准粒子激发的各向异性表明在动量空间中在ky轴和kz轴附近存在多个点节点。这些结果可以一致地用手性B3u + iAu非单一态来解释，为UTe2的拓扑性质提供了基础。重费米子超导体UTe2可能表现出自旋三重态库珀配对，尽管单线态成分是可能的。在这里，通过磁渗透深度测量，作者发现了与UTe2中手性B3u+iAu自旋三重态超导性相一致的证据。
Chiral spin-triplet superconductivity is a topologically nontrivial pairing state with broken time-reversal symmetry, which can host Majorana quasiparticles. The heavy-fermion superconductor UTe2 exhibits peculiar properties of spin-triplet pairing, and the possible chiral state has been actively discussed. However, the symmetry and nodal structure of its order parameter in the bulk, which determine the Majorana surface states, remains controversial. Here we focus on the number and positions of superconducting gap nodes in the ground state of UTe2. Our magnetic penetration depth measurements for three field orientations in three crystals all show the power-law temperature dependence with exponents close to 2, which excludes single-component spin-triplet states. The anisotropy of low-energy quasiparticle excitations indicates multiple point nodes near the ky- and kz-axes in momentum space. These results can be consistently explained by a chiral B3u + iAu non-unitary state, providing fundamentals of the topological properties in UTe2. The heavy-fermion superconductor UTe2 likely exhibits spin-triplet Cooper pairing, although a singlet component is possible. Here, using magnetic penetration depth measurements, the authors find evidence consistent with chiral B3u+iAu spin-triplet superconductivity in UTe2.
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