Abstract
We fabricated Nb/Au/(Ca1-xSrx)CuO2/YBa2Cu3O7 superconducting heterostructures with ICRN product 100divide300 muV at T=4.2 K. Critical current density was 10 A/cm2 through 50 nm thick Ca1-xSrxCuO2 layer, and increased for thinner layers. Critical currents of the heterostructures had much smaller periods in lc(H) dependencies compare to Josephson junctions without anti ferromagnetic layer. Half- integer Shapiro steps and detector responses were observed for the most of heterostructures. Current phase relations of the heterostructures deviated from sinusoidal with 10divide40% portion of the second harmonic.
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