Possible Field-Temperature Phase Diagrams of Two-Band Superconductors with Paramagnetic Pair-Breaking

Abstract

Possible field-temperature superconducting (SC) phase diagrams in two-band quasi-two-dimensional materials with a strong paramagnetic pair-breaking (PPB) are considered theoretically. Attention is paid to the case under a magnetic field $perpendicular$ to the SC layers and to essential differences from the counterpart in the ordinary single-band material. It is found by examining the $H_{c2}(T)$ curve and the vortex lattices to be realized close to $H_{c2}$ that a PPB-induced SC phase with a spatial modulation parallel to the field tends to occur more easily than in the single-band case, and that a crisscrossing vortex lattice proposed previously can occur in place of the conventional Fulde-Ferrell-Larkin-Ovchinnikov state within a parameter range. The relevance of the obtained results to FeSe and other iron-based superconductors is discussed.

21 pages, 3 figures

References in corpus (6)

• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Evidence of Andreev bound states as a hallmark of the FFLO phase in $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Fulde-Ferrell-Larkin-Ovchinnikov state in a perpendicular field of quasi two-dimensional CeCoIn5
• Switching of magnetic domains reveals evidence for spatially inhomogeneous superconductivity
• High field superconducting phase diagrams including Fulde-Ferrell-Larkin-Ovchinnikov vortex states
• Antiferromagnetic Order oriented by Fulde-Ferrell-Larkin-Ovchinnikov Superconducting Order

Cited by in corpus (5)

• Evidence for an FFLO state with segmented vortices in the BCS-BEC-crossover superconductor FeSe
• Fluctuation Conductivity and Vortex State in Superconductor with Strong Paramagnetic Pair Breaking
• Superconducting meron phase in locally noncentrosymmetric superconductors
• Vortex Lattice Melting Line in Superconductors with Paramagnetic Pair-Breaking
• Microscopic evidence for Fulde-Ferrel-Larkin-Ovchinnikov state and multiband effects in KFe${}_2$As${}_2$