Universality of glass scaling in Bi2Sr2Ca1-xYxCu2O8 single crystals in thepresence of correlated disorder

Current-voltage characteristics are investigated in BiSr2Ca1-xYxCu2O8 cryst als irradiated parallel to the c-axis with 5.8 GeV Pb ions. Over a wide ran ge of filling fractions 0.026 less than or equal to f less than or equal to 1, the I-V isotherm curves near the superconducting transition are consist ent with the Bose-glass scaling theory. Field and matching field independen t critical exponent values z' = 5.27 +/- 0.05 and v' = 1.30 +/- 0.07 have b een found. This result is in good agreement with the well-established unive rsality rules for the critical exponents at standard second-order transitio n. The glass line, derived from scaling analysis, is well described by the Lindemann criterion that accounts for the contribution of correlated disord er. Two characteristic temperatures, beyond which the vortex system is incr easingly dominated by vortex-vortex interactions or thermal fluctuations, r espectively, are identified. In these domains, the Bose-glass melting line merges the pristine melting line, (C) 2000 Elsevier Science Ltd. All rights reserved.