Anomalous Superconducting Proximity Effect in Hybrid Oxide   Heterostructures with Antiferromagnetic Layer
  We report an investigation of current transport in Nb/Au/CaSrCuO/YBaCuO heterostructures including an antiferromagnetic interlayer (CaSrCuO). Epitaxial thin films of YBaCuO and CaSrCuO were grown by laser ablation on NdGaO substrates; the thicknesses of CaSrCuO films were 20 and 50 nm, and x=0.15 or 0.5. Our experimental results show that the superconducting current transport is increased in the Nb/Au/CaSrCuO/YBaCuO heterostructures in comparison with the ones observed in previously studied Nb/Au/YBaCuO heterostructures. It was found that the critical current of the structure is very sensitive to the absolute value and direction of the external magnetic field. 
G.A. Ovsyannikov, P. Komissinskiy, I.V. Borisenko, Yu.V. Kislinskii,   A.V. Zaitsev, K.Y. Constantinian, and D. Winkler