Momentum Dependence of the Superconducting Gap in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}

Journal Article · Mon Apr 03 04:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.74.2784· OSTI ID:46385

Ding, H; Campuzano, J C; Bellman, A F; Yokoya, T; Norman, M R; Randeria, M; Takahashi, T; Katayama-Yoshida, H; Mochiku, T; Kadowaki, K; Jennings, G ^[1]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

We measure the momentm dependence of the superconducting gap along the Fermi surface of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} by high resolution angle-resolved photoemission spectroscopy. The gap is large in the vicinity of the {ital M}{ovr bar} is along the (Cu-O bond), and small along the {Gamma}-{ital X} and {Gamma}-{ital Y}({pi},{pi}) directions. However, the gap is not zero along these directions, but, within our accuracy, becomes zero about 10{degree} on either side of the ({pi},{pi}) directions. We discuss the implications of these results for the symmetry of the order parameter.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 46385
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 74; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ANGULAR DISTRIBUTION
ANISOTROPY
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
DISPERSION RELATIONS
ELECTRONIC STRUCTURE
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
ORDER PARAMETERS
PHOTOEMISSION
STRONTIUM OXIDES
SYMMETRY