Anomalously large gap anisotropy in the [ital a]-[ital b] plane of Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+[delta]]
- Department of Applied Physics, Stanford University, Stanford, California 94305 (United States) Solid State Electronics Laboratory and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305-4055 (United States) Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Superconducting gap anisotropy at least an order of magnitude larger than that of the conventional superconductors has been observed in the [ital a]-[ital b] plane of Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+[delta]] in angle-resolved photoemission spectroscopy. For samples with [ital T][sub [ital c]] of 88 K, the gap size reaches a maximum of approximately 20 meV along the Cu-O bond direction, and a minimum of much smaller or vanishing magnitude 45[degree] away. The experimental data are discussed within the context of various theoretical models. In particular, a detailed comparison with what is expected from a superconductor with a [ital d][sub [ital x]][sup 2][minus][ital y][sup 2] order parameter is carried out, yielding a consistent picture.
- OSTI ID:
- 6737857
- Journal Information:
- Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 70:10; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANGULAR DISTRIBUTION
ANISOTROPY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
D WAVES
DISTRIBUTION
ELECTRON SPECTROSCOPY
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
ORDER PARAMETERS
OXIDES
OXYGEN COMPOUNDS
PARTIAL WAVES
PHOTOELECTRON SPECTROSCOPY
SPECTROSCOPY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS