Gap anisotropy in Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+[delta]] by ultrahigh-resolution angle-resolved photoemission
Journal Article
·
· Physical Review, B: Condensed Matter; (United States)
- Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States) Department of Physics, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607 (United States)
- Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
Ultrahigh-resolution ([Delta][ital E] up to 10 meV) angle-resolved photoemission spectroscopy on single crystals of Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+[delta]] (Bi-2212) show a highly anisotropic superconducting energy gap: the gap is minimized, with a value close to zero, along the [Gamma]-[ital X] and [Gamma]-[ital Y] symmetry directions, while a large gap ([Delta]=22 meV) is observed along the [Gamma]-[ital [bar M]] (Cu-O bond) direction. However, the observation of gap anisotropy may depend on sample conditions; in a few cases the gap becomes more isotropic. A dip in the spectral weight at 65 meV below the Fermi energy is clearly observed only in samples with an anisotropic gap.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 7045279
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:2; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRONIC STRUCTURE
EMISSION
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
SECONDARY EMISSION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TRANSITION ELEMENT COMPOUNDS
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRONIC STRUCTURE
EMISSION
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
SECONDARY EMISSION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TRANSITION ELEMENT COMPOUNDS