Phenomenological models for the gap anisotropy of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} as measured by angle-resolved photoemission spectroscopy

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.615· OSTI ID:82236

Norman, M R; Randeria, M ^[1]; Ding, H; Campuzano, J C ^[1]

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

Recently, high-resolution angle-resolved photoemission spectroscopy has been used to determine the detailed momentum dependence of the superconducting gap in the high-temperature superconductor Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}. In this paper, we first describe tight-binding fits to the normal-state dispersion and superlattice modulation effects. We then discuss various theoretical models in light of the gap measurements. We find that the simplest model which fits the data is the anisotropic {ital s}-wave gap cos({ital k}{sub {ital x}})cos({ital k}{sub {ital y}}), which within a one-band BCS framework suggests the importance of next-near-neighbor Cu-Cu interactions. Various alternative interpretations of the observed gap are also discussed, along with the implications for microscopic theories of high-temperature superconductors.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 82236
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ANISOTROPY
BCS THEORY
BISMUTH OXIDES
CALCIUM OXIDES
COPPER
ELECTRONIC STRUCTURE
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
PHOTOEMISSION
STRONTIUM OXIDES