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JOURNAL OF APPLIED PHYSICS
Volume 89, Issue 12, Pages 8026-8029Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1370994
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We report on the magnetic and superconducting properties of La0.7Ca0.3MnO3/YBa2Cu3O7 (LCMO/YBCO) superlattices. For a constant LCMO layer thickness of 6 unit cells (u.c.), resistance and susceptibility measurements show superconductivity for YBCO layer thickness in excess of 4 unit cells. The critical temperature increases with YBCO thickness, and a T-c of 58 K is found for a YBCO thickness of 10 unit cells. Magnetization measurements show a ferromagnetic transition at 100 K in a (LCMO6 u.c./YBCO5 u.c.)(15 bilayer) superlattice, and a depressed value of the saturation magnetization of 20 emu cm(-3). These results are discussed in terms of interface disorder (analyzed by x-ray diffraction and transmission electron microscopy) and of the possible interaction between magnetism and superconductivity. (C) 2001 American Institute of Physics.
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