Direct measurement of the superconducting properties of single grain boundaries in Y1Ba2Cu3O7−δ
P. Chaudhari, J. Mannhart, D. Dimos, C. C. Tsuei, J. Chi, M. M. Oprysko, M. Scheuermann
DOI 10.1103/PhysRevLett.60.1653 · Physical Review Letters
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Abstract
We have made the first direct measurements of the critical current density of individual grain boundaries and their adjoining grains in Y1Ba2Cu3O7−δ superconducting films. The critical current of the boundary was always found to be less than either of the two grains. The magnetic field dependence of the critical current of the grain boundaries indicates that they are comprised of regions of weak and strong Josephson coupling. A single grain boundary was also used to build and operate a simple dc SQUID. Current-voltage curves of a grain-boundary junction n the finite voltage range show subgap structure.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
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