Analysis of the fluctuation-induced excess dc conductivity of epitaxial YBa sub 2 Cu sub 3 O sub 7 films: Influence of a short-wavelength cutoff in the fluctuation spectrum

Journal Article · Mon Jul 01 00:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.44.741· OSTI ID:5742050

Hopfengaertner, R; Hensel, B; Saemann-Ischenko, G ^[1]

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1. Physikalisches Institut, Universitaet Erlangen, Erwin-Rommel-Strasse 1, D-8520 Erlangen, Federal Republic of Germany (DE)

Measurements of the temperature dependence of the in-plane dc conductivity on various high-quality epitaxial YBa{sub 2}Cu{sub 3}O{sub 7} films are presented. The rounding of the resistivity in the transition region has been analyzed in terms of the {ital anisotropic} Aslamazov-Larkin (AL), Lawrence-Doniach (LD), and Maki-Thompson theories. In the framework of the time-dependent Ginzburg-Landau (GL) approach we have investigated the influence of a short-wavelength cutoff parameter in the fluctuation spectrum of the AL and LD term. In both theories this physically reasonable cutoff leads to a considerable reduction of the predicted excess dc conductivity at higher temperatures. Moreover, the three-dimensional {ital anisotropic} AL term, taking the cutoff into account, predicts nearly the same excess conductivity as the original LD term, although these two approaches describe different systems. A good agreement between experimental data and LD as well as the modified {ital three}-dimensional anisotropic AL term was found in the region 1.01{ital T}{sub {ital c}}{le}{ital T}{le}1.1{ital T}{sub {ital c}}. The zero-temperature GL coherence length {xi}{sub {ital c}}(0) has been estimated to be about 1.5 A.

• OSTI ID: 5742050
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 44:2; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
EPITAXY
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
SUPERCONDUCTING FILMS
ELECTRIC CONDUCTIVITY
YTTRIUM OXIDES
ANISOTROPY
FLUCTUATIONS
GINZBURG-LANDAU THEORY
MEASURING METHODS
QUATERNARY COMPOUNDS
TEMPERATURE DEPENDENCE
THREE-DIMENSIONAL CALCULATIONS
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRICAL PROPERTIES
FILMS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
YTTRIUM COMPOUNDS
360603* - Materials- Properties
656100 - Condensed Matter Physics- Superconductivity