The experimentally received tunneling spectra with multiple gap-like conductance peaks frequently measured on YBa₂Cu₃O_x/Pb tunnel contacts, are discussed in the frame of two models: 1. parallel connection of NIS type tunnel junctions and 2. the intergranular tunneling between weakly connected YBa₂Cu₃O_x grains containing multiple phases in the tunneling region. It is shown that both models are capable to explain the observed main gap-like features.

Abstract

Experimentell erhaltene Tunnelspektren mit mehreren lückenartigen Leitfähigkeitsmaxima, wie sie haufig bei YBaCuO/Pb-Tunnelkontakten erhalten werden, werden im Rahmen von zwei Modellen diskutiert: 1. Parallelschaltung von SIN-Tunnelkontakten und 2. intergranulares Tunneln zwischen schwach verbundenen YbaCuO_x-Körnern, die im Tunnelbereich verschiedene Phasen bzw. Energielükken enthalten. Er wird gezeigt, daß beide Modelle einsetzbar sind, um die beobachteten lückenartigen Strukturen zu erklären.

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Volume132, Issue2

16 August 1992

Pages 445-451

Multigap Structure Measured by Tunneling Spectroscopy on the Yba₂Cu₃O_x Materials

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Multigap Structure Measured by Tunneling Spectroscopy on the Yba2Cu3Ox Materials

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Multigap Structure Measured by Tunneling Spectroscopy on the Yba₂Cu₃O_x Materials