Vertex Corrections in Antiferromagnetic Spin Fluctuation Theories

Journal Article · Sun Sep 01 00:00:00 EDT 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.77.3017· OSTI ID:385789

Sharifzadeh Amin, M H; Stamp, P C ^[1]

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1. Physics Department and Canadian Institute for Advanced Research, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, V6T 1Z1 (CANADA)

We calculate the first vertex correction {delta}{Lambda}{sub {ital k}} to the bare vertex {Lambda}{sub 0} in the nearly antiferromagnetic spin fluctuation Fermi-liquid theory of the cuprate supercondutor YBa{sub 2}Cu{sub 3}O{sub 7}. It is calculated for {ital k} on the Fermi surface, and {ital Q}=({plus_minus}{pi}/{ital a},{plus_minus}{pi}/{ital a}). We find that the dimensionless ratio {vert_bar}{delta}{Lambda}{sub {ital k}}{vert_bar}/{Lambda}{sub 0}, which parametrizes the vertex correction, is not small. It is a maximum for {ital k}={ital k}{sub {ital h}}, where {ital k}{sub {ital h}} is a {open_quote}{open_quote}hot spot{close_quote}{close_quote} on the Fermi surface. This makes large quantitative corrections to the theory. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 385789
• Journal Information: Physical Review Letters, Vol. 77, Issue 14; Other Information: PBD: Sep 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
ANTIFERROMAGNETISM
SPIN
FERMI LEVEL
BRILLOUIN ZONES
YTTRIUM OXIDES
BARIUM OXIDES
COPPER OXIDES
VERTEX FUNCTIONS