Transport Properties of Tl2Ba2CaCu2O8 Meander Lines

We have measured the electrical transport properties of 10 cm long Tl2Ba2CaCu2O8 thin film meander lines in magnetic fields up to 18T. The large resistance of the meander line effectively increased the electric field, or equivalently, resistivity sensitivity by two orders of magnitude. In moderate magnetic fields the critical current density is found to depend only on the component of the magnetic field normal to the ab planes owing to the highly anisotropic nature of the system. The resistivity versus temperature was measured as a function of magnetic field up to 18T. The linear resistivity is found to vanish in a manner consistent with the occurrence of a second order phase transition. The critical exponent v(z-1) is virtually field independent with a value 5.3±1 consistent with previous measurements of a three dimensional vortex glass transition in YBa2Cu3O7 and Bi2Sr2CaCu2O8. The critical regime is 10-15K wide in agreement with values for Bi2Sr2CaCu2O8 at high magnetic field.