Magneto-electric field induced activation energy in LSMO imbedded YBCO superconductor

Abstract

Thick films of YBa2Cu3O7-δ/La 0.67Sr0.33MnO3 have been prepared by diffusion reaction technique. The phase formation and surface morphology have been analyzed through XRD and SEM. From temperature dependent resistivity measurement, under the application of magnetic field, the broadening of resistive transition in the grain boundary region attributes to dissipative of flux pinning. The transition temperature (Tc) and onset of global superconductivity (TC0) marked decreasing value and the resistive broadening is more prominent below the critical temperature in presence of magnetic field for La 0.67Sr0.33MnO3 incorporated into YBa2Cu3O7-δ. From the slope of the Arrhenius plot, we have calculated the activation energy for thermally activated flux flow. Using the Ambegaokar and Halperin phase-slip model, both the magnetic and electric field dependence of activation energy has been interpreted. The above phase slip model followed a power law as (1-t)q with q = 1/2 and t = (T/Tc) has been discussed. The field independent metallic region above 100 K that follows a weak localization effect is being verified.