Abstract
An elaborately designed bilayer consisting of epitaxial YBa 2Cu 3O7−δ (YBCO) and La 0.67Sr 0.33MnO 3−δ (LSMO) films is prepared on a single crystal SrTiO 3 (STO) substrate by pulsed laser deposition (PLD), with respect to the investigation into the influence of spin diffusion on superconductivity. Structural measurements reveal that the present bilayer has good textures of both in-plane and out-of-plane as well as perfect superconducting layer without residual stress. Nevertheless, obviously suppressed superconductivity is found in the bilayer, as evidenced by the reduced superconducting transition temperature and critical current density. It is believed that the suppressed superconductivity arises from the spin diffusion effect due to the comparable length scales of the spin diffusion length and the superconducting film thickness.
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