Tunneling in cuprate and bismuthate superconductors
- Illinois Inst. of Tech., Chicago, IL (United States). Dept. of Physics
- Argonne National Lab., IL (United States)
Tunneling measurements using a point-contact technique are reported for the following high temperature superconducting oxides: Ba{sub 1-x}K{sub x}BiO{sub 3}( BKBO ), Nd{sub 2-x}Ce{sub x}CuO{sub 4}( NCCO ), Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 7}( BSCCO ) and Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub x} ( 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, {alpha}{sup 2}F({omega}), 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 {Angstrom} thick.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10107976
- Report Number(s):
- ANL/CP-74820; CONF-9109102-4; ON: DE92004135; CNN: Grant DMR-8809854
- Resource Relation:
- Conference: 5. annual conference on superconductivity and applications,Buffalo, NY (United States),24-26 Sep 1991; Other Information: PBD: Oct 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HIGH-TC SUPERCONDUCTORS
TUNNEL EFFECT
CUPRATES
BISMUTH OXIDES
CALCIUM OXIDES
STRONTIUM OXIDES
THALLIUM OXIDES
BARIUM OXIDES
NEODYMIUM OXIDES
CERIUM OXIDES
POTASSIUM OXIDES
ENERGY GAP
SPECTROSCOPY
PROXIMITY EFFECT
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