Andreev reflections in the pseudogap state of cuprate superconductors
Han-Yong Choi, Yunkyu Bang, David K. Campbell
DOI 10.1103/PhysRevB.61.9748 · Physical Review B
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Abstract
We propose that if the pseudogap state in the cuprate superconductors can be described in terms of the phase-incoherent preformed pairs, there should exist Andreev reflection from these pairs even above the superconducting transition temperature Tc. After giving qualitative arguments for this effect, we present more quantitative calculations based on the Bogoliubov–de Gennes equation. Experimental observations of the effects of Andreev reflections above Tc—such as an enhanced tunneling conductance below the gap along the copper oxide plane—could provide unambiguous evidence for the preformed pairs in the pseudogap state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | unknown |
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