Magnetic field scaling of the vortex glass resistivity in oxygen deficientYBa2Cu3O7-delta single crystals

The in-plane resistivity of an oxygen deficient YBa2Cu3O7-delta single crys tal has been measured as a function of magnetic field B \\ c-axis in the ra nge 0 T less than or equal to B less than or equal to 12 T. A scaling relat ion is found for the linear resistivity at p less than or similar to 0.1 rh o(n) above the glass line that incorporates all studied temperatures and ma gnetic fields. Our scaling can be understood within a simple model where th e mean pinning energy balances the thermal energy at the glass transition, U-0(B, T-g) = k(B)Th(g), with U-0(B, T) resembling a generalized condensati on energy, U-0 similar to (1 - T/T-c)(m)/B-beta. (C) 2000 Elsevier Science B.V. All rights reserved.