Josephson tunneling spectroscopy of negative-U centers
Vadim Oganesyan, Steven Kivelson, Theodore Geballe, Boris Moyzhes
DOI 10.1103/PhysRevB.65.172504 · Physical Review B
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Abstract
We consider a superconductor-insulator-superconductor (SIS) junction in which the tunneling through the insulating barrier is dominated by a localized “negative-U” center. We show that the IcR product of the junction depends sensitively on the spectrum of impurity states, and in near-resonant conditions exhibits an anomalously large IcR product which can exceed the famous Ambegoakar-Baratoff limit by an arbitrarily large factor. The analysis is extended to problems in which there is an array of negative-U centers in the junction. We also discuss general reasons to expect significant violations of the optical conductivity sum rule in most SIS junctions and of the Ambegoakar-Baratoff result when the superconductors emerge from a non-Fermi liquid normal state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PbTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | Pressure not reported | unknown |
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