Abstract
Proximity effect between YBCO and a magnetic manganese oxide, La 1−xCa xMnO z (LCMO) or La 1−x Sr xMnO z (LSMO), was investigated through junction characteristics and ferromagnetic resonance (FMR). The experimental study revealed that supercurrents pass through the magnetic material only in the region where the magnetic state changes from ferromagnetism to antiferromagnetism, where spin fluctuation is large. Temperature dependence of g-value was investigated by FMR for LCMO film and YBCO/LCMO/YBCO laminated films. It was shown that itinerancy was maintained at low temperature only for the laminated films. The results suggest that a certain kind of spin interaction, like spin-spin interaction via charge transfer, occurs between the YBCO and the LCMO. A physical picture for proximity effect coupled to spin dynamics is discussed.
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