Bose-glass transition in irradiated Bi2Sr2Ca1-xYxCu2O8 crystals

Current-voltage characteristics are investigated in Bi2Sr2Ca1-xYxCu2O8 crys tals irradiated parallel to the c-axis with 5.8 GeV Pb ions. Over a wide ra nge of filling fractions 0.026 less than or equal to f less than or equal t o 1, I-V isotherm curves near the superconducting transition are consistent with the Bose-glass scaling theory. The Bose glass line, derived from scal ing analysis, is well described by the Lindemann criterion which accounts f or the contribution of correlated disorder. Two characteristic temperatures t(0)approximate to0.72 (f approximate to0.8) and t(1)approximate to0.83 (f approximate to1/3), beyond which the vortex system is increasingly dominat ed by vortex-vortex interactions or thermal fluctuations, respectively, are identified.