Bose-Glass Phase in TwinnedYBa2Cu3O7−δ

Abstract

Using an extensive scaling analysis of the transport properties in twinned ${\mathrm{YBa}}_2{\mathrm{Cu}}_3{\mathrm{O}}_{7-\delta }$ crystals we have experimentally found the predicted change in the universality class of the Bose-glass to liquid transition when the magnetic field is applied at small angles away from the direction of the correlated defects. The new dynamical critical exponent is $s^{\prime }=1.1\mathrm{}\pm 0.3$.