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FLUCTUATION CONDUCTIVITY OF YBACUO EPITAXIAL THIN-FILMS GROWN ON VARIOUS SUBSTRATES

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National Technical University of Athens   

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FLUCTUATION CONDUCTIVITY OF YBACUO EPITAXIAL THIN-FILMS GROWN ON VARIOUS SUBSTRATES (EN)
PATAPIS, SK (EN)
PHILLIPS, JM (EN)
JONES, EC (EN)
LOWNDES, DH (EN)
NORTON, DP (EN)
journalArticle (EN)
2014-03-01T01:43:51Z
1995 (EN)
The fluctuation conductivity, in zero applied magnetic field, is analyzed for different high-quality c oriented epitaxial thin films of Y1Ba2Cu3O7-x grown on various substrates; one ex-situ grown on single crystal LaAlO3 and one in-situ grown on crystalline KTaO3. and one in-situ grown on polycrystalline YSZ. From the temperature dependence of the thermal fluctuation behavior, critical exponents are extracted, without fitting parameters, and the fluctuation dimensionality is deduced, Our findings are explicitly consistent with the thin-film structure of the sample and the conductivity behavior model proposed by Maki and Thompson. The first two epitaxial films show 2D dimensionality with a weak Maki-Thompson pair-breaking mechanism above T-c, and a cross-over to a 3D dimensionality near T-c. Moreover, the insensitivity to different substrate-induced lattice strains suggests that lattice strains do not alter the fluctuation behavior. The findings suggest a percolative mechanism in the polycrystalline film. (EN)
Physics, Applied (EN)
HIGH-TC SUPERCONDUCTORS (EN)
FRACTAL BEHAVIOR (EN)
SINGLE-CRYSTAL (EN)
TRANSPORT-PROPERTIES (EN)
INPLANE PARACONDUCTIVITY (EN)
THERMODYNAMIC FLUCTUATIONS (EN)
YBA2CU3O7-X (EN)
TEMPERATURE SUPERCONDUCTORS (EN)
RESISTIVITY (EN)
CERAMIC SUPERCONDUCTORS (EN)
PHYSICA C (EN)
English
ELSEVIER SCIENCE BV (EN)
National Technical University of Athens
Digital Library of National Technical University of Athens | Dspace@NTUA
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
Ιδρυματικό Αποθετήριο
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