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

Journal Article · Mon May 25 00:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.68.3240· OSTI ID:7110717

Li, Y; Huang, J L; Lieber, C M ^[1]

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1. 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), Vol. 68:21; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
ENERGY GAP
CALCIUM OXIDES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
STRONTIUM OXIDES
ELECTRIC CONDUCTIVITY
ELECTRON BEAMS
ENERGY LOSSES
FREQUENCY DEPENDENCE
TEMPERATURE DEPENDENCE
ALKALINE EARTH METAL COMPOUNDS
BEAMS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRICAL PROPERTIES
LEPTON BEAMS
LOSSES
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)