Disappearance of Bose-Glass Behavior in Transport Properties of YBa₂Cu₃O_y Films with Columnar Defects

Author： Nojima T. Katakura M. Okayasu S. Endo S. Kobayashi N.

ISSN： 0022-2291

Source： Journal of Low Temperature Physics, Vol.131, Iss.5-6, 2003-06, pp. : 859-863

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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 &θ; of B to the direction of columnar defects. At &θ;=0°, we find an anomalous upturn behavior of the glass transition line B_g(T) at B∼B_&&phis;;/3, where B_&&phis;; is the matching field. In B>B_&&phis;;/3, the &θ; dependence of glass transition temperature T_g reveals cusplike behavior with a peak at &θ;=0°, which is consistent with the Bose glass theory. In B<B_&&phis;;/3, on the other hand, T_g is almost independent of &θ;, suggesting the system undergoes the vortex glass transition induced by the inherent point-like defects.

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