  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.
