Energy Gap Induced by Impurity Scattering: New Phase Transition in Anisotropic Superconductors
摘要：
It is shown that layered superconductors are subjected to a phase transitionat zero temperature provided the order parameter (OP) reverses its sign on theFermi-surface but its angular average is finite. The transition is regulated byan elastic impurity scattering rate $1/au$. The excitation energy spectrum,being gapless at the low level of scattering, develops a gap as soon as thescattering rate exceeds some critical value of $1/au_\star$.
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DOI：
10.1103/PhysRevLett.75.1150
被引量：
年份：
1995
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