Tunneling in cuprate and bismuthate superconductors [electronic resource].

Published:: Arlington, Va. : National Science Foundation (U.S.), 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 12 pages : digital, PDF file
Additional Creators:: Argonne National Laboratory, National Science Foundation (U.S.), and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Tunneling measurements using a point-contact technique are reported for the following high temperature superconducting oxides: Ba{sub 1-x}KₓBiO₃( BKBO ), Nd{sub 2-x}CeₓCuO₄( NCCO ), Bi₂Sr₂CaCu₂O₇( BSCCO ) and Tl₂Ba₂CaCu₂Oₓ ( TBCCO ). For the bismuthate, BKBO, ideal, S-I-N tunneling characteristics are observed using a Au tip. The normalized conductance is fitted to a BCS density of states and thermal smearing only proving there is no fundamental limitation in BKBO for device applications. For the cuprates, the normalized conductance displays BCS-like characteristics, but with a broadening larger than from thermal smearing. Energy gap values are presented for each material. For BKBO and NCCO the Eliashberg functions, α²F(ω), obtained from the tunneling are shown to be in good agreement with neutron scattering results. Proximity effect tunneling studies are reported for Au/BSCCO bilayers and show that the energy gap of BSCCO can be observed through Au layers up to 600 Å thick.

Report Numbers:

E 1.99:anl/cp--74820
E 1.99: conf-9109102--4
conf-9109102--4
anl/cp--74820

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Note:

Published through SciTech Connect.
10/01/1991.
"anl/cp--74820"
" conf-9109102--4"
"DE92004135"
": Grant DMR-8809854"
5. annual conference on superconductivity and applications,Buffalo, NY (United States),24-26 Sep 1991.
Gray, K.E.; Zasadzinski, J.F.; Tralshawala, N.; Huang, Qiang.

Funding Information:

W-31109-ENG-38

View MARC record | catkey: 14063455