Observation of Josephson pair tunneling between a high-Tc cuprate (YBa2Cu3O7−δ) and a conventional superconductor (Pb)

A. G. Sun; D. A. Gajewski; M. B. Maple; R. C. Dynes

doi:10.1103/PhysRevLett.72.2267

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Observation of Josephson pair tunneling between a high-Tc cuprate (YBa2Cu3O7−δ) and a conventional superconductor (Pb)

A. G. Sun, D. A. Gajewski, M. B. Maple, R. C. Dynes

DOI 10.1103/PhysRevLett.72.2267 · Physical Review Letters

T1

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Abstract

Josephson tunneling currents have been observed on low leakage Pb/insulator/Y1−xPrxBa2Cu3O7−δ tunnel junctions. The junctions are planar with tunneling into the c axis. We have studied these Josephson currents on junctions with resistances varying by more than 2 orders of magnitude. From the magnetic field modulation of the Josephson current, the low temperature value and the temperature dependence from 1.3 to 4.2 K of the c-axis penetration depth were measured. This observation of Josephson coupling along the c axis between a conventional superconductor (Pb) and a cuprate raises questions about the proposed d-wave nature of the superconducting order parameter in the cuprates.

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.	—	Pressure not reported	unknown
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.19	Pressure not reported	onset
Y0.9Pr0.1Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown