Evidence for a Josephson tunnel current in all in situ c-YBa2Cu3O7/Pb junctions
J. Lesueur, M. Aprili, A. Goulon, T. J. Horton, L. Dumoulin
DOI 10.1103/PhysRevB.55.R3398 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
All in situ YBu2Cu3O7/Pb and YBa2Cu3O7/Ag/Pb planar tunnel junctions have been successfully made on c-axis-oriented YBa2Cu3O7 thin films grown by a coevaporation technique, which show very-low-leakage I-V characteristics. The junctions are hysteretic and display a Josephson current Ic below 7.2 K (lead Tc). The only modification introduced by Ag is a substantial lowering of the normal-state resistance Rn, but the IcRn product remains roughly constant. The magnetic-field modulation of Ic shows that the current distribution is rather homogeneous over the whole junction area (0.5 mm2), and follows the expected behavior for a short junction on a thin film (thickness <λab). The Josephson coupling between a conventional superconductor and the high-Tc compound YBa2Cu3O7 along its c axis indicates that an s component is present in the superconducting order parameter of this material.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | onset |
Similar papers
Experimental evidence for a d-wave pairing state in YBa2Cu3O7−y from a study of YBa2Cu3O7−y/insulator/Pb Josephson tunnel junctions
similarity 0.97I. Iguchi & Z. Wen
Source status unknown — claims are unverified
Observation of mesoscopic conductance fluctuations in YBa2Cu3O7−δ grain boundary Josephson junctions
similarity 0.96A. Tagliacozzo et al.
Source status unknown — claims are unverified
Highly anisotropic supercurrent transport in YBa2Cu3O7−δ bicrystal Josephson junctions
similarity 0.95Z. G. Ivanov et al.
Source status unknown — claims are unverified
Observation of the Josephson Effect in Pb/Ba1−xKxFe2As2 Single Crystal Junctions
similarity 0.95Xiaohang Zhang et al.
Source status unknown — claims are unverified
Josephson tunneling of anisotropic high-Tc d-wave junctions with tilted ab-plane YBa2Cu3O7−y electrodes
similarity 0.95H. Arie et al.
Source status unknown — claims are unverified
Observation of Josephson pair tunneling between a high-Tc cuprate (YBa2Cu3O7−δ) and a conventional superconductor (Pb)
similarity 0.95A. G. Sun et al.
Source status unknown — claims are unverified