Energy Gap Induced by Impurity Scattering: New Phase Transition in Anisotropic Superconductors

Details Energy Gap Induced by Impurity Scattering: New Phase Transition in Anisotropic Superconductors Energy Gap Induced by Impurity Scattering: New Phase Transition in Anisotropic Superconductors

1995-03-10

arxiv.org/abs/cond-mat/9503059v1

Physics

Condensed Matter

Revtex, 11 pages

Scientific paper

10.1103/PhysRevLett.75.1150

It is shown that layered superconductors are subjected to a phase transition at zero temperature provided the order parameter (OP) reverses its sign on the Fermi-surface but its angular average is finite. The transition is regulated by an elastic impurity scattering rate $1/\tau$. The excitation energy spectrum, being gapless at the low level of scattering, develops a gap as soon as the scattering rate exceeds some critical value of $1/\tau_\star$.

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