Tunneling in cuprate and bismuthate superconductors
Conference
·
OSTI ID:10107976
- 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
- Country of Publication:
- United States
- Language:
- English
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Tunneling spectroscopy measurements on low-leakage junctions of Nd sub 1. 85 Ce sub 0. 15 CuO sub 4 minus y and Ba sub 1 minus x K sub x BiO sub 3
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Related Subjects
36 MATERIALS SCIENCE
360207
665411
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
BISMUTH OXIDES
CALCIUM OXIDES
CERIUM OXIDES
CUPRATES
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
NEODYMIUM OXIDES
POTASSIUM OXIDES
PROXIMITY EFFECT
SPECTROSCOPY
STRONTIUM OXIDES
THALLIUM OXIDES
TUNNEL EFFECT
360207
665411
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
BISMUTH OXIDES
CALCIUM OXIDES
CERIUM OXIDES
CUPRATES
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
NEODYMIUM OXIDES
POTASSIUM OXIDES
PROXIMITY EFFECT
SPECTROSCOPY
STRONTIUM OXIDES
THALLIUM OXIDES
TUNNEL EFFECT