YBCO/Pb tunnel junctions

Reproducibility, cyclability and role of the oxygen content at the Ybco surface

A. M. Cucolo, R. Di Leo, P. Romano, Lynn Schneemeyer, J. V. Waszczak

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)

Abstract

We have realized planar tunnel junctions on liquid etched YBa2Cu3O7-δ (YBCO) single crystals with a native barrier and a Pb film as counterelectrode. Reproducibility of the tunneling characteristics has been tested on more than 150 junctions. Cyclability was good for 6 thermal cycles over the course of 6 months. The main features on the dV /dI vs V curves were gap-like structures at 4–5 mV and 19 mV and well defined minima at 36m V The amplitudes of these structures show little change when the YBCO single crystals were exposed 24 hours to room atmosphere prior to the Pb evaporation. By heating the samples for lh at in vacuum before the counterelectrode was applied to complete the junction, the structures broaden and shift towards higher energies. For all junctions, sub-gap leakage currents were less than 5% at 4.2K and the Pb gap and phonon structures were clearly shown on the tunneling characteristics indicating a good quality tunnel barrier.

Original languageEnglish
Pages (from-to)1349-1352
Number of pages4
JournalIEEE Transactions on Magnetics
Volume27
Issue number2
DOIs
StatePublished - 1 Jan 1991

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Tunnel junctions
Single crystals
Oxygen
Leakage currents
Tunnels
Evaporation
Vacuum
Heating
Liquids
barium copper yttrium oxide
Hot Temperature

Cite this

Cucolo, A. M. ; Di Leo, R. ; Romano, P. ; Schneemeyer, Lynn ; Waszczak, J. V. / YBCO/Pb tunnel junctions : Reproducibility, cyclability and role of the oxygen content at the Ybco surface. In: IEEE Transactions on Magnetics. 1991 ; Vol. 27, No. 2. pp. 1349-1352.
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YBCO/Pb tunnel junctions : Reproducibility, cyclability and role of the oxygen content at the Ybco surface. / Cucolo, A. M.; Di Leo, R.; Romano, P.; Schneemeyer, Lynn; Waszczak, J. V.

In: IEEE Transactions on Magnetics, Vol. 27, No. 2, 01.01.1991, p. 1349-1352.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - YBCO/Pb tunnel junctions

T2 - Reproducibility, cyclability and role of the oxygen content at the Ybco surface

AU - Cucolo, A. M.

AU - Di Leo, R.

AU - Romano, P.

AU - Schneemeyer, Lynn

AU - Waszczak, J. V.

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