Suppression of low-energy Andreev states by a supercurrent in YBa_2Cu_3O_7-delta
arXiv:cond-mat/0505691 · doi:10.1103/PhysRevB.72.054513
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 YBa_2Cu_3O_7-delta 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 gap-like 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 BTK 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.
6 pages, 4 figures, to appear in Physical Review B
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Cited by in corpus (5)
- Probing the superfluid velocity with a superconducting tip: the Doppler shift effect
- Tunneling Spectroscopy on c-axis Y{1-x}Ca{x}Ba2Cu3O{7-delta} Thin Films
- Local tunneling probe of (110) Y_0.95Ca_0.05Ba_2Cu_3O_7-delta thin films in a magnetic field
- Impact of the transport supercurrent on the density of states in the weak link
- Conductance characteristics of current-carrying d-wave weak links