Non-universal glass scaling behavior in transport properties of YBa sub(2)Cu sub(3 )O sub(y) films with columnar defects

Vortex phase diagrams have been studied on heavy-ion irradiated YBa sub(2)Cu sub(3 )O sub(y) films by the measurements of current-voltage (I-V) characteristics, resistance R and critical current density J sub(c) as a function of magnetic field B parallel to the columnar defects. In the scaling analy...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2002-10, Vol.378-381, p.593-597
Main Authors: Nojima, T, Katakura, M, Okayasu, S, Kobayashi, N
Format: Article
Language:English
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Summary:Vortex phase diagrams have been studied on heavy-ion irradiated YBa sub(2)Cu sub(3 )O sub(y) films by the measurements of current-voltage (I-V) characteristics, resistance R and critical current density J sub(c) as a function of magnetic field B parallel to the columnar defects. In the scaling analyses of the I-V data, we find the non-universal nature of the glass transition. The dynamic critical exponent z, which is almost constant at high fields, shows an anomalous peak and the glass transition line T sub(g)(B) reveals an upturn behavior at B [similar to] B sub( phi )/3 with B sub( phi ) the matching field, where we also observe step-like behavior both in R(B) and J sub(c)(B) curves. These results indicate the existence of a temperature-independent boundary in the B-T plane at which the dissipation mechanism changes. copyright 2002 Elsevier Science B.V. All rights reserved.
ISSN:0921-4534