Influence of the oxygen content on the tunneling characteristics of YBa sub 2 Cu sub 3 O sub 7 minus. delta

Journal Article · Thu Aug 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.44.2857· OSTI ID:5341695

Cucolo, A M; Di Leo, R; Romano, P ^[1]; Schneemeyer, L F; Waszczak, J V ^[2]

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1. Dipartimento di Fisica, Universita di Salerno, 84081 Baronissi (Italy)
2. AT T Bell Laboratories, Murray Hill, New Jersey, (USA)

We have formed planar tunnel junctions between Pb films and YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals with different surface oxygen stoichiometries. Oxygen losses have been induced by heating the crystals at 400 {degree}C in vacuum for different times. Low-leakage tunnel junctions have also been obtained in the case of the most degraded'' samples. As the oxygen deficiency increases, the Y-Ba-Cu-O gaplike structure gradually broadens and shifts towards higher energies. For thermally untreated samples, tunneling spectroscopy gives information on the local {ital T}{sub {ital c}}.

• OSTI ID: 5341695
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:6; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
CUPRATES
DESORPTION
ELEMENTS
HIGH-TC SUPERCONDUCTORS
LEAD
METALS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
QUANTITY RATIO
QUANTUM ELECTRONICS
QUATERNARY COMPOUNDS
SPECTROSCOPY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TUNNEL EFFECT
YTTRIUM COMPOUNDS
YTTRIUM OXIDES