Impurity bands in magnetic superconductors with spin density wave

Abstract

Magnetic superconductors define a broad class of strongly correlated materials in which superconductivity may coexist with either localized or itinerant long-range magnetic order. In this work we consider a multiband model of a disordered magnetic superconductor which realizes coexistence of unconventional superconductivity and a spin-density-wave. We derive an exact $T$-matrix and compute a single particle density of states in this system. In a purely superconducting state the interband scattering potential leads to an appearance of the localized Yu-Shiba-Rusinov bound states. Our main finding is that in the fairly broad swath of the coexistence region superconductivity remains fully gapped despite the presence of the impurity bands. We also discuss the effects of spatial inhomogeneities on the density of states in strongly contaminated superconductors.

11 pages, 4 figures [Annals of Physics special issue on selected topics in condensed matter theory]

References in corpus (9)

• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2
• Disorder-induced topological change of the superconducting gap structure in iron pnictides
• Phase soliton and pairing symmetry of a two-band superconductor: Role of the proximity effect
• Pair breaking due to orbital magnetism in iron-based superconductors
• The Lifshitz nature of the transition between the gap and gapless states of a superconductor
• General theory of robustness against disorder in multi-band superconductors
• Inhomogeneous magnetic multiband superconductors
• Thermodynamic properties of nodal superconductors close to a magnetic quantum critical point