Effect of disorder on superconductivity in the boson-fermion model

Abstract

We study how a randomness of either boson or fermion site energies affects the superconducting phase of the boson fermion model. We find that, contrary to what is expected for s-wave superconductors, the non-magnetic disorder is detrimental to the s-wave superconductivity. However, depending in which subsystem the disorder is located, we can observe different channels being affected. Weak disorder of the fermion subsystem is responsible mainly for renormalization of the single particle density of states while disorder in the boson subsystem directly leads to fluctuation of the strength of the effective pairing between fermions.

7 pages, 6 figures. Physical Review B (accepted for publication)

References in corpus (5)

• Resonance superfluidity in a quantum degenerate Fermi gas
• Prospect of creating a composite fermi/bose superfluid
• Plaquette Boson-Fermion Model of Cuprates
• Non-linear feedback effects in coupled Boson-Fermion systems
• Anisotropic Superconductivity in the Induced Pairing Model

Cited by in corpus (3)

• Novel results in STM, ARPES, HREELS, Nernst, neutron, Raman, and isotope substitution experiments and their relation to bosonic modes and charge inhomogeneity, from perspective of negative-Ueff boson-fermion modelling of HTSC
• Real space inhomogeneities in high temperature superconductors: the perspective of two-component model
• Effects of Disorder on Superconductivity of Systems with Coexisting Itinerant Electrons and Local Pairs