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- W44097040 abstract "The point-contact (Pt-Ir probe) tunneling measurements on high-{ital T}{sub {ital c}} superconducting Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} single crystals ({ital T}{sub {ital c}}=82{degree} K) have been performed from 4.2 K to 77 K. A high conductance region around the origin, which is attributed to the junction of the pure metallic-bridge type of point-contact tunneling, has been observed. There are also several current steps beyond the high conductance region in the I-V curves, corresponding to conductance troughs, which are either zero or negative, in the dI/dV characteristics of the tunneling spectra. These are pronounced structures indicative of bound states in tunneling spectroscopy. A superconducting energy gap of {Delta}=26{plus minus}2 meV has been identified from tunneling spectra taken at {ital T}=4.2 K and as a function of temperature. Current drops with some regularity in voltage intervals between drops, occur at high applied voltage ({gt}80 mV). This resonance tunneling is the result of the effects of quantization due to the layered-structure of the crystal. A model based on the superlattice-like nature of the crystal has been developed to interpret the tunneling observation of the bound states and the energy gap. When a normal-metal probe is brought into contact with the superconducting crystal, themore » region of the first CaCuO slab under that contact will be most likely reduced to a low {ital T}{sub {ital c}} region with a smaller energy gap {Delta}{sub 1}, or even completely reduced to the normal state, due to the work function difference between the normal metal and the superconductor and/or the proximity effect. However, the second CaCuO slab remains in the intrinsic superconducting state with energy gap {Delta}{sub 2}{gt}{Delta}{sub 1}.« less" @default.
- W44097040 created "2016-06-24" @default.
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- W44097040 date "1992-04-01" @default.
- W44097040 modified "2023-09-23" @default.
- W44097040 title "Point contact tunneling study of the high transition temperature superconductor Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8" @default.
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