Defect-unbinding and the Bose-glass transition in layered superconductors
C. J. van der Beek, M. Konczykowski, A. V. Samoilov, N. Chikumoto, S. Bouffard, M. V. Feigel'man
Abstract
The low-field Bose-glass transition temperature in heavy-ion irradiated Bi2Sr2CaCu2O8+d increases progressively with increasing density of irradiation-induced columnar defects, but saturates for densities in excess of 1.5 x109 cm-2. The maximum Bose-glass temperature corresponds to that above which diffusion of two-dimensional pancake vortices between different vortex lines becomes possible, and above which the ``line-like'' character of vortices is lost. We develop a description of the Bose-glass line that is in excellent quantitative agreement with the experimental line obtained for widely different values of track density and material parameters.
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