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Published on: August 2, 2019
Orbital-effect-induced finite-momentum pairing and Josephson vortex lattice melting in layered Ising superconductors
Hongyi Yan1,2, Haiwen Liu1,2,3, Yi Liu4,5
1Center for Advanced Quantum studies, School of Physics and Astronomy, Beijing Normal University, Beijing 100875, China.
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 that 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.
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