2021/03/31 by D. C. Cavanagh, P. M. R. Brydon
Chemistry · Materials Science · Mathematics · Physics and Astronomy · #Chemistry #Condensed matter physics #Electron #Fermi Gamma-ray Space Telescope #Fermi energy #Fermi level #Fermi surface #Hamiltonian (control theory) #Iron-based superconductors research #Mathematics #Pairing #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Robustness (evolution) #Scattering #Superconductivity #Topological Materials and Phenomena #Topology (electrical circuits) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.104.014503
published as Phys. Rev. B 104, 014503 (2021)
openalex created_date 2021/03/29 · arxiv created 2021/04/15 · openalex publication_date 2021/07/09 · arxiv updated 2021/07/13 · openalex updated_date 2026/08/05
We investigate the influence of general forms of disorder on the robustness of superconductivity in multiband materials. Specifically, we consider a general two-band system where the bands arise from an orbital degree of freedom of the electrons. Within the Born approximation, we show that the interplay of the spin-orbital structure of the normal-state Hamiltonian, disorder scattering, and superconducting pairing potentials can lead to significant deviations from the expected robustness of the superconductivity. This can be conveniently formulated in terms of the so-called ``superconducting fitness.'' In particular, we verify a key role for unconventional s-wave states, permitted by the spin-orbital structure and which may pair electrons that are not time-reversed partners. To exemplify the role of Fermi-surface topology and spin-orbital texture, we apply our formalism to the candidate topological superconductor CuxBi2Se3, for which only a single band crosses the Fermi energy, as well as models of the iron pnictides, which possess multiple Fermi pockets.