Energy Gap Induced by Impurity Scattering: New Phase Transition in Anisotropic Superconductors
Sergei V. Pokrovsky, Valery L. Pokrovsky
DOI 10.1103/PhysRevLett.75.1150 · Physical Review Letters
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Abstract
It is shown that layered superconductors are subjected to a phase transition at zero temperature provided the order parameter reverses its sign on the Fermi surface but its angular average is finite. The transition is regulated by an elastic impurity scattering rate 1/τ. 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/τ*.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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