Prof. Anna Maria Cucolo Profile

Prof. Anna Maria Cucolo

at Univ degli Studi di Salerno

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Proceedings Article | 22 December 1998 Paper

Different tunnel barriers for c-axis-oriented Y(Ho)BaCuO-based trilayer heterostructures

Anna Maria Cucolo

Proceedings Volume 3481, (1998) https://doi.org/10.1117/12.335890

KEYWORDS: Superconductors, Heterojunctions, Interfaces, Electrodes, Dielectrics, Superconductivity, Lead, Oxygen, Copper, Physics

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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 PrBa₂Cu₃O_7-(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 YBa₂Cu₃O_7-(delta )/PrBa₂Cu₃O_{7- (delta} )/HoBa₂Cu₃O_7-(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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