Suppression of low-energy Andreev states by a supercurrent in YBa2Cu3O7−δ
J. Ngai, P. Morales, J. Y. T. Wei
DOI 10.1103/PhysRevB.72.054513 · Physical Review B
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Abstract
We report a coherence length scale phenomenon related to how the high-Tc order parameter (OP) evolves under a directly-applied supercurrent. Scanning tunneling spectroscopy was performed on current-carrying YBa2Cu3O7−δ thin-film strips at 4.2K. At current levels well below the theoretical depairing limit, the low-energy Andreev states are suppressed by the supercurrent, while the gaplike structures remain unchanged. We rule out the likelihood of various extrinsic effects and propose instead a model based on phase fluctuations in the d-wave Blonder-Tinkham-Klapwijk formalism to explain the suppression. Our results suggest that a supercurrent could weaken the local phase coherence while preserving the pairing amplitude. Other possible scenarios which may cause the observed phenomenon are also discussed.
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. | 87 | Pressure not reported | unknown |
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