ut2中的高场超导晕

IF 45.8 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-07-31 DOI:10.1126/science.adn7673

Sylvia K. Lewin, Peter Czajka, Corey E. Frank, Gicela Saucedo Salas, G. Timothy Noe II, Hyeok Yoon, Yun Suk Eo, Johnpierre Paglione, Andriy H. Nevidomskyy, John Singleton, Nicholas P. Butch

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引用次数: 0

摘要

重费米子材料ut2是一种候选拓扑超导体，具有多个磁场诱导的超导相。一个这样的相位只存在于大于40特斯拉的电场中，考虑到它的临界温度只有2k，这是相当大的规模。在这里，我们用bc晶体平面外的场扩展了这种状态的测量，并揭示了它的核心结构：超导相以晕状的方式包裹在b轴周围，似乎被垂直于磁易轴的场分量稳定下来。这种角度依赖关系指向库珀对具有有限角动量的多分量自旋三重态序参数。这种配对机制仍然是个谜，而且ut2特有的亲磁超导倾向似乎与现有的场增强超导模型不相容。

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High-field superconducting halo in UTe2

The heavy fermion material UTe₂ is a candidate topological superconductor that exhibits multiple magnetic field–induced superconducting phases. One such phase exists only at fields greater than 40 tesla, a considerable scale given its critical temperature of only 2 K. Here, we extend measurements of this state with fields outside of the bc crystallographic plane and reveal its core structure: The superconducting phase wraps around the b axis in a halo-like fashion and appears to be stabilized by a field component perpendicular to the magnetic easy axis. This angle dependence points to a multicomponent spin-triplet order parameter with a finite angular momentum of the Cooper pairs. The pairing mechanism remains enigmatic, and UTe₂’s specific magnetophilic superconducting tendencies seem incompatible with existing models for field-enhanced superconductivity.

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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