Disappearance of Bose-Glass Behavior in Transport Properties of YBa2Cu3O
y
Films with Columnar Defects |
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Authors: | T Nojima M Katakura S Okayasu S Endo N Kobayashi |
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Affiliation: | (1) Center for Low Temperature Science, Tohoku University, Sendai, 980-8577, Japan;(2) Japan Atomic Energy Research Institute, Ibaraki, 319-1195, Japan |
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Abstract: | The glass transitions of the vortex system in Au-ion irradiated YBa2Cu3O
y
films have been studied by the measurements of transport properties as a function of magnetic field B and angle of B to the direction of columnar defects. At =0°, we find an anomalous upturn behavior of the glass transition line B
g(T) at B B
/3, where B
is the matching field. In B>B
/3, the dependence of glass transition temperature T
g reveals cusplike behavior with a peak at =0°, which is consistent with the Bose glass theory. In B<B
/3, on the other hand, T
g is almost independent of , suggesting the system undergoes the vortex glass transition induced by the inherent point-like defects. |
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Keywords: | |
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