Absence of Andreev reflections and Andreev bound states above the critical temperature
Y. Dagan, A. Kohen, G. Deutscher, A. Revcolevschi
DOI 10.1103/PhysRevB.61.7012 · Physical Review B
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Abstract
We present measurements of the temperature dependence of the differential conductance of normal-metal/underdoped high-Tc superconductors contacts. Both Y1Ba2Cu3O7−x thin films and La2−xSrxCuO4 single crystals were studied. The effect of direct Andreev reflections, or of Andreev bound states, do not persist above the critical temperature. Our results are consistent with an Andreev energy scale that does not follow the doping dependence of the pseudogap, but rather that of the critical temperature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1Ba2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.85 | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure not reported | unknown |
| Bi2Sr2Ca1Cu2O8 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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