  We report on the electronic transport and the impact of spin-filtering in
mesa-structures made of epitaxial thin films of cuprate superconductor
YBa2Cu3Ox(YBCO) and the manganite LaMnO3 (LMO) interlayer with the Au/Nb
counterelectrode. Ferromagnetic resonance measurements of heterostructure
Au/LMO/YBCO shows ferromagnetic state at temperatures below 150 K as in the
case of reference LMO film grown on the neodymium gallate substrate. The
heights of the tunneling barrier evaluated from resistive characteristics of
mesa-structures at different thickness of interlayer showed an exponential
decrease from 30 mV down to 5 mV with the increase of manganite interlayer
thickness. Temperature dependence of the conductivity of mesa-structures could
be described taking into account the d-wave superconductivity in YBCO and a
spin filtering of the electron transport. Spin filtering is supported also by
measurements of magneto-resistance and the high sensitivity of mesa-structure
conductivity to weak magnetic fields.
