Correlations between the Hall coefficient and the superconducting transport properties of oxygen-deficient YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] epitaxial thin films

Journal Article · Thu Apr 01 00:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.8986· OSTI ID:6952798

Jones, E C ^[1]; Christen, D K ^[2]; Thompson, J R ^[3]; Feenstra, R ^[2]; Zhu, S ^[1]; Lowndes, D H ^[2]; Phillips, J M; Siegal, M P ^[4]; Budai, J D ^[5]

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1. Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)
2. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6061 (United States)
3. Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States) Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6061 (United States)
4. AT T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (United States)
5. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennes

Strong correlations between the Hall coefficient [ital R][sub [ital H]], the transition temperature [ital T][sub [ital c]], and the critical current density [ital J][sub [ital c]] were established in a series of epitaxial YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] thin films as a function of oxygen deficiency [delta]. Steady increases in [ital R][sub [ital H]] with [delta] suggest that deoxygenation reduces the density of states which, according to BCS theory, should lead to corresponding decreases in [ital T][sub [ital c]]. In contrast, two well-known plateaus occurring at 90 K and 60 K were observed in [ital T][sub [ital c]] vs [delta]. Others have ascribed these plateaus to either electronic phenomena or phase separations. We find that in the 90-K plateau, the critical current density [ital J][sub [ital c]]([delta],[ital H]=0) decreases with [delta] and extrapolates toward zero at the edge of the plateau, while the relative-field dependence of [ital J][sub [ital c]]([delta],[ital H]) and the flux-creep pinning energies are independent of [delta]. These observations suggest that the phase-separation scenario occurs on the 90-K plateau. However, electronic origins cannot be ruled out at present due to difficulties in determining the equilibrium superconducting properties of oxygen-deficient YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] films.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6952798
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 47:14; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
HALL EFFECT
COPPER OXIDES
YTTRIUM OXIDES
CORRELATIONS
CRITICAL CURRENT
CRITICAL TEMPERATURE
EPITAXY
HIGH-TC SUPERCONDUCTORS
THIN FILMS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
ELECTRIC CURRENTS
FILMS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)