Tunneling in cuprate and bismuthate superconductors [electronic resource]
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| Online Access: |
Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Dept. of Defense ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1991.
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| Subjects: |
| Abstract: | 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. |
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| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 10/01/1991. "anl/cp-74820" " conf-9109102--4" "DE92004135" ": 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. . Dept. of Physics; Huang, Qiang. |
| Physical Description: | Pages: (12 p) : digital, PDF file. |