We have formed planar tunnel junctions between Pb films and YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals with different surface oxygen stoichiometries. Oxygen losses have been induced by heating the crystals at 400 {degree}C in vacuum for different times. Low-leakage tunnel junctions have also been obtained in the case of the most degraded'' samples. As the oxygen deficiency increases, the Y-Ba-Cu-O gaplike structure gradually broadens and shifts towards higher energies. For thermally untreated samples, tunneling spectroscopy gives information on the local {ital T}{sub {ital c}}.
INFLUENCE OF THE OXYGEN-CONTENT ON THE TUNNELING CHARACTERISTICS OF YBA2CU3O7-DELTA
ROMANO P;
1991-01-01
Abstract
We have formed planar tunnel junctions between Pb films and YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals with different surface oxygen stoichiometries. Oxygen losses have been induced by heating the crystals at 400 {degree}C in vacuum for different times. Low-leakage tunnel junctions have also been obtained in the case of the most degraded'' samples. As the oxygen deficiency increases, the Y-Ba-Cu-O gaplike structure gradually broadens and shifts towards higher energies. For thermally untreated samples, tunneling spectroscopy gives information on the local {ital T}{sub {ital c}}.File in questo prodotto:
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