Abstract
We report the experimental investigations of the suppression of superconductivity due to the pair breaking effect induced by ferromagnetic layer in YBa2Cu3O7−δ /La0.5Sr0.5CoO3 and YBa2Cu3O7−δ /La0.7Sr0.3MnO3 bi-layers fabricated by pulsed laser deposition. The current dependent electrical transport studies in the bilayers exhibit a significant reduction in the superconducting transition temperature in accord to I 2/3 law as compared to single YBa2Cu3O7−δ layer, and moreover the superconducting transition temperature in YBa2Cu3O7−δ /La0.7Sr0.3MnO3 bilayer is surprisingly found to be much larger than the YBa2Cu3O7−δ /La0.5Sr0.5CoO3. It appears that the current driven from a low spin polarization (−11%) material like La0.5Sr0.5CoO3 can also suppress the superconductivity to a larger extent. This indicates that the degree of spin polarization of the ferromagnetic electrode is not the only criteria to determine the suppression of superconductivity by pair breaking effect in superconductor/ferromagnet hybrid structures; rather the transparency of the interface for the spin polarization, the formation of vortex state due to the stray field of ferromagnetic layer and the ferromagnetic domain patterns might play significant roles to determine such effect.
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