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 04:00:00 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), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:14; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

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