Abstract
We have devised a new nanoscale experimental method to probe the “pairing-without-condensation” scenario driven by phase fluctuations in high- T c superconductors, using scanning tunneling spectroscopy on current-carrying YBa 2Cu 3O 7− δ thin-film structures at 4.2 K. We observed suppression of the phase-sensitive Andreev-bound states by the applied current, without variation of the d-wave pairing symmetry and amplitude. These results are interpreted as evidence for nanoscale dephasing of the high- T c order parameter under a pair current.
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