Temperaure dependence of the energy gap in Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8 superconductors by high-resolution electron-energy-loss spectroscopy
- Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138 (United States)
High-resolution electron-energy-loss spectroscopy has been used to determine the magnitude and temperture dependence of the energy gap for oxygen annealed Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} single crystals. Below the {ital T}{sub {ital c}}, low-energy excitations are detected in the energy-loss spectra. These spectra are proportional to the frequency-dependent resistivity, {rho}({omega}), and thus the energy gap can be determined directly from the onset of {rho}({omega}). We find that at low temperature 2{Delta}=6{ital kT}{sub {ital c}} and that {Delta} develops sharply for {ital T}{lt}{ital T}{sub {ital c}}. The similarity of these results to the predictions of models that consider spin interactions suggests that higher {ital T}{sub {ital c}}'s may be obtainable in this material.
- OSTI ID:
- 7110717
- Journal Information:
- Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 68:21; ISSN PRLTA; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BEAMS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON BEAMS
ENERGY GAP
ENERGY LOSSES
FREQUENCY DEPENDENCE
HIGH-TC SUPERCONDUCTORS
LEPTON BEAMS
LOSSES
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS