Enhanced superconducting properties in ultrathin YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] layers
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6056 (United States)
The superconducting properties of ultrathin [ital c]-axis-oriented YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]](YBCO) layers can be significantly enhanced by use of more conductive buffer and cap layers. In particular, Pr[sub 0.5]Ca[sub 0.5]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]]/YBCO/Pr[sub 0.5]Ca[sub 0.5]Ba[sub 5] Cu[sub 3]O[sub 7[minus][delta]] trilayer structures, with YBCO layer thickness as small as 1 unit cell, have superior transport properties to PrBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]]/YBCO/PrBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] structures, including an increase in [ital T][sub [ital c]] and a narrower superconducting transition. The enhanced superconducting properties that result from using Ca-(hole) doped buffer and cap layers may be a result of a diminished perturbation of the order parameter at growth-related steps in the electrical continuity of the YBCO layer.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6238610
- Journal Information:
- Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 63:10; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BUFFERS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
HETEROJUNCTIONS
HIGH-TC SUPERCONDUCTORS
JUNCTIONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SEMICONDUCTOR JUNCTIONS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SUPERLATTICES
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES