Planar tunnel junctions on 90 K and 60 K YBCO single crystals. Superconducting and normal state properties

A. M. Cucolo, R. C. Dynes, J. M. Valles, Lynn Schneemeyer

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Abstract

We have studied the tunneling characteristics of planar junctions made on YBCO single crystals with Tc=90 K and Tc=60 K. Natural barriers of good quality have been obtained on both compounds. In comparison with the 90 K phase, the superconducting conductance curves of the 60 K phase show gap-like structures reduced in amplitude and shifted towards higher energies. For the higher Tc material, a gap opening, at about 90 K, is observed. Normal state conductances, measured at T>Tc, are highly linear in voltage on both compounds and have steeper slopes on the 60 K phase. The slopes are quite insensitive to temperature variations, and do not depend on the junction resistances nor on the materials used as counterelectrodes.

Original languageEnglish
Pages (from-to)69-74
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume179
Issue number1-3
DOIs
StatePublished - 15 Aug 1991

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Tunnel junctions
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Single crystals
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title = "Planar tunnel junctions on 90 K and 60 K YBCO single crystals. Superconducting and normal state properties",
abstract = "We have studied the tunneling characteristics of planar junctions made on YBCO single crystals with Tc=90 K and Tc=60 K. Natural barriers of good quality have been obtained on both compounds. In comparison with the 90 K phase, the superconducting conductance curves of the 60 K phase show gap-like structures reduced in amplitude and shifted towards higher energies. For the higher Tc material, a gap opening, at about 90 K, is observed. Normal state conductances, measured at T>Tc, are highly linear in voltage on both compounds and have steeper slopes on the 60 K phase. The slopes are quite insensitive to temperature variations, and do not depend on the junction resistances nor on the materials used as counterelectrodes.",
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Planar tunnel junctions on 90 K and 60 K YBCO single crystals. Superconducting and normal state properties. / Cucolo, A. M.; Dynes, R. C.; Valles, J. M.; Schneemeyer, Lynn.

In: Physica C: Superconductivity and its applications, Vol. 179, No. 1-3, 15.08.1991, p. 69-74.

Research output: Contribution to journalArticle

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T1 - Planar tunnel junctions on 90 K and 60 K YBCO single crystals. Superconducting and normal state properties

AU - Cucolo, A. M.

AU - Dynes, R. C.

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