Abstract
Current-voltage characteristics are investigated in Bi 2Sr 2Ca 1-xY xCu 2O 8 crystals irradiated parallel to the c-axis with 5.8 GeV Pb ions. Over a wide range of filling fractions 0.026 ≤ f ≤ 1, I–V isotherm curves near the superconducting transition are consistent with the Bose-glass scaling theory. The Bose glass line, derived from scaling analysis, is well described by the Lindemann criterion which accounts for the contribution of correlated disorder. Two characteristic temperatures t 0≈0.72 (f≈0.8) and t 1≈0.83 (f≈ 1 3 ), beyond which the vortex system is increasingly dominated by vortex-vortex interactions or thermal fluctuations, respectively, are identified.
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