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Author Zasadzinski, R. ♦ Vandervoort, K. G. ♦ Crabtree, G. W.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ SUPERCONDUCTING JUNCTIONS ♦ PROXIMITY EFFECT ♦ NIOBIUM ♦ GOLD ♦ BISMUTH OXIDES ♦ STRONTIUM OXIDES ♦ CALCIUM OXIDES ♦ COPPER OXIDES ♦ MERCURY OXIDES ♦ ELECTRON MICROSCOPY ♦ TUNNEL EFFECT ♦ ENERGY GAP ♦ STM
Abstract Proximity effect gaps were observed consistently in Nb/Au, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{ital y}}/Au, and HgBa{sub 2}CuO{sub 4}/Ag bilayers using a low temperature scanning tunneling microscope. The Nb/Au conductance curves [{ital dI}({ital V})/{ital dV} vs {ital V}] were fit by the Arnold model, using the accepted energy gap value of Nb, 1.55 meV. The application of gold and silver overlayers allowed vacuum tunneling and topographic images of BSCCO single crystals and the HgBa{sub 2}CuO{sub 4} polycrystalline sample. Cleavage steps of varying sizes (up to 1500 A) in the BSCCO/Au sample were observed, and gaplike features were found on such steps. Consistent, reproducible energy gaps were also found in the Hg-compound sample. {copyright} {ital 1996 American Institute of Physics.}
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-05-01
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 79
Issue Number 10


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