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Published May 1, 1992 | Published
Journal Article Open

High anisotropy and a dimensionality crossover in the irreversibility behavior of oxygen-deficient YBa_2Cu_3O_(7-y)

Abstract

The width in temperature of the reversible, lossy state of high-temperature superconductors (HTS's) in a magnetic field H depends on the degree of anisotropy. Compared to the parent compound YBa_2Cu_3O_(7-y), we show here that oxygen-deficient, YBa_2Cu_3O_(7-y) single crystals, in which T_c was varied from 10 to 55 K, are much more anisotropic and that the occurrence of the reversible, lossy state for the H parallel-to c axis is consistent with a crossover from three-dimensional (3D) vortex lines to 2D vortices, as recently proposed for the other highly anisotropic HTS's. These results, together with those from Tl_2Ba_2CaCu_2O_x and Bi_2Sr_2CaCu_2O_x, indicate universal behavior of almost isolated Cu-O bilayer units, albeit with different doping levels, and which display magnetic reversibility controlled by the residual weak interplanar coupling.

Additional Information

© 1992 The American Physical Society. Received 25 November 1991. This work is partially supported by the U.S. Department of Energy, Division of Basis Energy Sciences- Materials Sciences (K.E.G. and D.H.K.) under Contract No. W-31-109-ENG-38 and the National Science Foundation (DMR 88-09854) through the Science and Technology Center for Superconductivity (G.T.S. and T.F.R.). The work at Case Western Reserve University (D.E.F.) was supported by NASA Grants No. NAG-3-814 and No. NCC 123 and by the National Science Foundation Grant No. NSF-DMR 89-13651.

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