Order parameter sign-reversal near -superconductor surface
arXiv:1003.2773 · doi:10.1134/S0021364010080114
Abstract
The superconducting order parameter and LDOS spectra near an impenetrable surface are studied on the basis of selfconsistent calculations for a two band superconductor with nodeless extended s-+wave order parameter symmetry, as possibly realized in Fe-based high-temperature superconductors. It is found that for a wide range of parameters the spatial behavior of the order parameter at a surface is not reduced to a trivial suppression. If the interband scattering at a surface is of the order of the intraband one or dominates it, it can be energetically favorable to change the symmetry of the superconducting state near the surface from to conventional s-wave. The range of existing this surface conventional superconductivity is very sensitive to the relative values of interband and intraband pairing potentials. It is shown that the LDOS spectra near the surface can qualitatively differ upon calculating with and without taking into account the selfconsistency of the order parameter.
5 pages, 5 figures
References in corpus (12)
- Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsOF}
- Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
- Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
- Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
- Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
- Multiband magnetism and superconductivity in Fe-based compounds
- Valley density-wave and multiband superconductivity in Fe-pnictides
- CeFePO: A Heavy Fermion Metal with Ferromagnetic Correlations
- The scattering problem in non-equilibrium quasiclassical theory of metals and superconductors: general boundary conditions and applications
- Local moment versus Kondo behavior of the 4f-electrons in rare-earth iron oxypnictides
- Theory of Andreev reflection in junctions with iron-based High- superconductors
- Surface Bound States in n-band Systems with Quasiclassical Approach