Effect of disorder on superconductivity in the boson-fermion model

Details Effect of disorder on superconductivity in the boson-fermion model Effect of disorder on superconductivity in the boson-fermion model

2002-06-14

arxiv.org/abs/cond-mat/0206267v1

Phys. Rev. B 66, 064517 (2002)

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevB.66.064517

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.

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