Abstract
Transport properties across the interface between a ferromagnet and a high- T c superconductor are studied in La 0.67Sr 0.33MnO 3/YBa 2Cu 3O 7− δ (LSMO/YBCO) junctions. We observed magnetic-field response of conductance spectra peculiar to LSMO/YBCO junctions, i.e., increase of background conductance and asymmetric zero-bias conductance peak splitting. It is shown that these features are consistent with a theory which assumes the presence of a ferromagnetic insulating layer between a spin-polarized ferromagnet and a d-wave superconductor.
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