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Author Sharifzadeh Amin, M. H. ♦ Stamp, P. C.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ HIGH-TC SUPERCONDUCTORS ♦ ANTIFERROMAGNETISM ♦ SPIN ♦ FERMI LEVEL ♦ BRILLOUIN ZONES ♦ YTTRIUM OXIDES ♦ BARIUM OXIDES ♦ COPPER OXIDES ♦ VERTEX FUNCTIONS
Abstract 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.}
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-09-01
Publisher Place United States
Journal Physical Review Letters
Volume Number 77
Issue Number 14


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