Abstract
The I–V characteristics and the magnetoresistive transition of a-axis oriented EuBa 2Cu 3O 7 thin films grown by DC magnetron sputtering have been measured as a function of temperature. Evidence is found of a second order transition with critical exponents v=1.1 and z=8.5, greater than those reported in literature for c-axis films. The temperature dependence of the magnetoresistivity slightly above T g can be fitted to a scaling behavior ϱ ~ ( T− T g ) s with s≈8. These high values of the critical exponents may be attributed to a softening of the vortex lattice due to sample microstructure.
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