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TT: Fachverband Tiefe Temperaturen

TT 34: Fe-based Superconductors

TT 34.2: Vortrag

Mittwoch, 29. März 2023, 11:45–12:00, HSZ 103

Electronic theory for FFLO state in KFe₂As₂ superconductor — •Luka Jibuti and Ilya Eremin — Ruhr Universität Bochum, Bochum, Germany

Following the experimental observation of the Frude-Ferrel-Larnik-Ovchinnikov (FFLO) state in heavily hole-doped KFe₂As₂, we develop a microscopic theory of multi-orbital FFLO phase in this system, based on the microscopic low-energy model consisting of two Γ-centered hole pockets created by xz and yz orbitals and the sizeable spin-orbit coupling between them. We use the leading angular harmonics approximation (LAHA) to write down the general form of the interaction, that involves both s-wave and d-wave channels. By decomposing the interaction into s- and d-wave channels, employing the mean-field approximation and solving the self-consistent equations for the order parameters, we analyse the creation of the FFLO phase, with the appearance of the non-zero, symmetry preserving q vector for the nodal d-wave state and s-wave with accidental nodes. We also discuss the role of spin-orbit coupling and possible orbital FFLO state, discussed recently in the context of Ising superconductors.