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22 December 1998 Different tunnel barriers for c-axis-oriented Y(Ho)BaCuO-based trilayer heterostructures
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We compare the tunneling behavior of artificial Y(Ho)BaCuO- based HTS-I-HTS trilayers with our previous data obtained in YBaCuO/Pb junctions with natural barriers. Y2O3, SrTiO3 and PrBa2Cu3O7-(delta ) have been used as insulating layers in the HTS-based heterostructures that, investigated by X-ray and HREM TEM analysis, all showed good structural properties. However, we cannot exclude spurious effects due to the critical interface formation with the Y(Ho)BaCuO superconducting electrodes in the tunneling characteristics of the Y2O3, SrTiO3 trilayers. For the YBa2Cu3O7-(delta )/PrBa2Cu3O7- (delta )/HoBa2Cu3O7-(delta ) junctions, we have found quasi-ideal conductance characteristics with maxima at V equals plus or minus 40 mV. These values well relate to the plus or minus 20 mV structures measured in YBaCuO/Pb junctions with natural barriers. The low values of the G(O)/G(100 mV) approximately equals 0.05 and the flat background conductances measured in the artificial junctions, seem to confirm better defined interfaces in these structures with CuO2 planes facing the barrier insulating layer.
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Anna Maria Cucolo "Different tunnel barriers for c-axis-oriented Y(Ho)BaCuO-based trilayer heterostructures", Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998);

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