Particular type of gap in the spectrum of multiband superconductors

Abstract

We show, that in contrast to the free electron model (standard BCS model), a particular gap in the spectrum of multiband superconductors opens at some distance from the Fermi energy, if conduction band is composed of hybridized atomic orbitals of different symmetries. This gap has composite superconducting-hybridization origin, because it exists only if both the superconductivity and the hybridization between different kinds of orbitals are present. So for many classes of superconductors with multiorbital structure such spectrum changes should take place. These particular changes in the spectrum at some distance from the Fermi level result in slow convergence of the spectral weight of the optical conductivity even in quite conventional superconductors with isotropic s-wave pairing mechanism.

6 pages, 4 figures

References in corpus (9)

• Proximity of antiferromagnetism and superconductivity in LaO${}_{1-x}$F${}_x$FeAs: effective Hamiltonian from ab initio studies
• High - Temperature Superconductivity in Iron Based Layered Compounds
• Using Gap Symmetry and Structure to Reveal the Pairing Mechanism in Fe-based Superconductors
• Low-energy microscopic models for iron-based superconductors: a review
• Doping Dependence of the Redistribution of Optical Spectral Weight in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Sum rules and energy scales in the high-temperature superconductor YBa2Cu3O6+x
• Superconductivity-induced optical anomaly in an iron arsenide
• Effective Hamiltonian for FeAs based superconductors
• Fermi-Surface Topology and Pairing Symmetry in BiS${}_2$-Based Layered Superconductors