Charge-transfer and barrier-layer effects in YBa[sub 2]Cu[sub 3]O[sub 7] superlattices

Journal Article · Tue Nov 01 04:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.13688· OSTI ID:6955569

Wood, R F ^[1]

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1. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6032 (United States)

Superconducting superlattices composed of YBa[sub 2]Cu[sub 3]O[sub 7] and various barrier-layer'' materials have been studied extensively experimentally and several theoretical attempts to correlate the resistivity [ital R] as a function of temperature [ital T] with the superlattice structure have appeared in the literature. Theoretical interest in such structures comes about primarily because of the insight they may provide into dimensionality effects, interlayer coupling, and interlayer charge redistribution in the high-[ital T][sub [ital c]] superconductors. In this paper, [ital R]([ital T]) data up to [ital T]=300 K are analyzed by least-squares fitting for 17 superlattices consisting of YBa[sub 2]Cu[sub 3]O[sub 7] and barrier layers of PrBa[sub 2]Cu[sub 3]O[sub 7], Pr[sub 0.7]Y[sub 0.3]Ba[sub 2]Cu[sub 3]O[sub 7], and Pr[sub 0.5]Ca[sub 0.5]Ba[sub 2]Cu[sub 3]O[sub 7]. The fitting model incorporates results from Kosterlitz-Thouless (vortex-antivortex unbinding) and Aslamazov-Larkin (fluctuation-enhanced conductivity) theories in the resistive transition region and charge-transfer effects, variable-range hopping, etc., in the normal state. The results show that interface'' and barrier-layer conductivity must be taken into account in order to explain the unusual normal-state [ital R]([ital T]) behavior in some superlattices. These effects may also contribute in the transition region where vortex-antivortex unbinding and fluctuation effects play the major roles.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6955569
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:18; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
665411 -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHARGE EXCHANGE
COPPER COMPOUNDS
COPPER OXIDES
FILMS
LEAST SQUARE FIT
MAXIMUM-LIKELIHOOD FIT
NUMERICAL SOLUTION
OXIDES
OXYGEN COMPOUNDS
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
RARE EARTH COMPOUNDS
SUPERCONDUCTING FILMS
SUPERLATTICES
TEMPERATURE RANGE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES