Density-of-states-driven anisotropies induced by momentum decoupling in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.R6877· OSTI ID:383203

Varelogiannis, G ^[1]; Perali, A; Cappelluti, E; Pietronero, L ^[2]

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1. Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, P.O. Box 1527, Heraklion Crete 71110 (Greece)
2. Dipartimento di Fisica, Universita di Roma ``La Sapienza,`` Piazzale A. Moro 2, I-00185 Roma (Italy)

Momentum decoupling arises when small-{ital q} scattering dominates the pairing interaction and implies density-of-states-driven anisotropies in superconductivity. In this scheme we explain puzzling aspects of the anisotropy in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}, such as the correlation of gap magnitude and visibility of the dip above the gap, the enhancement of anisotropy with temperature, the presence of gap minima away from the {Gamma}-{ital X} direction and a gap maximum in the {Gamma}-{ital X} direction, the similarity of tunnel and angle-resolved photoemission spectra in the {Gamma}-{ital {bar M}} direction, and the asymmetry in vacuum tunnel spectra where the dip structure is present only at negative sample bias. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 383203
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
ELECTRONIC STRUCTURE
ENERGY GAP
ENERGY-LEVEL DENSITY
HIGH-TC SUPERCONDUCTORS
PAIRING INTERACTIONS
PHOTOEMISSION
STRONTIUM OXIDES
TUNNEL EFFECT