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Transport and Conductance spectra measurements of ramp-type junctions made ofcuprate superconducting $La_{1.9}Sr_{0.1}CuO_4$ electrodes and a manganiteferromagnetic $La_{0.67}Ca_{0.33}MnO_3$ barrier are reported. At lowtemperatures below $T_c$, the conductance spectra show Andreev-like broad peakssuperposed on a tunneling-like background, and sometimes also sub-gap Andreevresonances. The energy gap values $\Delta$ found from fits of the data rangedmostly between 7-10 mV. As usual, the gap features were suppressed undermagnetic fields but revealed the tunneling-like conductance background. Afterfield cycling to 5 or 6 T and back to 0 T, the conductance spectra were alwayshigher than under zero field cooling, reflecting the negative magnetoresistanceof the manganite barrier. A signature of superparamagnetism was found in theconductance spectra of junctions with a 12 nm thick LCMO barrier. Observedcritical currents with barrier thickness of 12 nm or more, were shown to be anartifact due to incomplete milling of one of the superconducting electrodes.

physical review. b, condensed matter and materials physics

Transport and spectroscopic properties of superconductor - ferromagnet -  superconductor junctions of $La_{1.9}Sr_{0.1}CuO_4$ -  $La_{0.67}Ca_{0.33}MnO_3$ - $La_{1.9}Sr_{0.1}CuO_4$