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
Conference
·
· IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)
OSTI ID:5717788
- Illinois Inst. of Tech., Chicago, IL (United States)
- Argonne National Lab., IL (United States). Materials Science and Technology Div.
In this paper tunneling measurements are reported for Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4{minus}y} (NCCO) and Ba{sub 1{minus}x}K{sub x}BiO{sub 3} (BKBO) using the point-contact technique with a Au or Nb tip. The junctions display very low zero-bias conductance values of {lt}1% for BKBO and {approximately} 10% for NCCO, and show sharp conductance peaks at eV = {plus minus} {Delta}. In the case of BKBO, the normalized conductance can be fit with a BCS density of states with thermal smearing only. The energy gaps are in good agreement with optical measurements and lead to values of 2{Delta}/kT{sub c} in the range of 3.5--4.0 for both compounds implying moderate coupling strength.
- OSTI ID:
- 5717788
- Report Number(s):
- CONF-900944--
- Conference Information:
- Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Journal Volume: 27:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BCS THEORY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
ELEMENTS
ENERGY GAP
GOLD
GORKOV-ELIASHBERG THEORY
JUNCTIONS
METALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NIOBIUM
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
RARE EARTH COMPOUNDS
SPECTROSCOPY
SUPERCONDUCTING JUNCTIONS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNNEL EFFECT
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BCS THEORY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
ELEMENTS
ENERGY GAP
GOLD
GORKOV-ELIASHBERG THEORY
JUNCTIONS
METALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NIOBIUM
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
RARE EARTH COMPOUNDS
SPECTROSCOPY
SUPERCONDUCTING JUNCTIONS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNNEL EFFECT