近日，北京师范大学刘海文团队报道了轨道效应诱导的层状伊辛超导体有限动量配对和约瑟夫森涡旋晶格熔化。2026年2月10日，《国家科学评论》杂志发表了这一成果。

富尔德-费雷尔-拉尔金-奥夫钦尼科夫态是一种引人注目的超导相，其特征是在强磁场下的非常规超导体中出现空间调制的序参量。

研究组探讨面内磁场对层状伊辛超导体中超导态的影响。该发现揭示了轨道效应诱导的有限动量配对态的出现，该态与约瑟夫森涡旋耦合，且与FFLO态有本质区别。值得注意的是，近期实验在块体伊辛超导体中观测到意外的一级相变。该理论分析表明，这一相变主要由约瑟夫森涡旋晶格的熔化所驱动。此外，研究组针对面内上临界场及熔化线的计算结果与实验数据高度吻合。这些成果不仅增进了对层状伊辛超导体中新型场致相态的理解，更为通过磁场调控这些奇异量子态开辟了路径。

附：英文原文

Title: Orbital effect induced finite-momentum pairing and Josephson vortex lattice melting in layered Ising superconductors

Author: Yan, Hongyi, Liu, Haiwen, Liu, Yi, Zhang, Ding, Xie, X C

Issue&Volume: 2026-02-10

Abstract: The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is a fascinating superconducting phase characterized by a spatially modulated order parameter that occurs in unconventional superconductors under strong magnetic fields. In this study, we explore the impact of in-plane magnetic fields on the superconducting state in layered Ising superconductors. Our findings reveal the emergence of an orbital-effect-induced finite-momentum pairing state, which is coupled to Josephson vortices and is fundamentally different from the FFLO state. Notably, recent experiments have revealed an unexpected first-order phase transition in bulk Ising superconductors. Our theoretical analysis demonstrates that this phase transition is primarily driven by the melting of a Josephson vortex lattice. Furthermore, our calculations for both the in-plane upper critical field and the melting line are in excellent agreement with the experimental data. These results not only advance the understanding of novel field-induced phases in layered Ising superconductors, but also pave the way for controlling these exotic states through magnetic field manipulation.

DOI: 10.1093/nsr/nwag084

Source: https://dx.doi.org/10.1093/nsr/nwag084