Physics – Condensed Matter
Scientific paper
1996-01-19
Physics
Condensed Matter
13 pages, RevTeX, 2 figures, Minor changes including tabular values have been made. The main conclusions have not been changed
Scientific paper
10.1103/PhysRevLett.77.3017
We calculate the first vertex correction $\delta\Lambda_{\bf k}$ to the bare vertex $\Lambda_\circ$ in the nearly antiferromagnetic spin fluctuation Fermi liquid theory of the cuprate superconductor ${\rm YBa_2Cu_3O_7}$. It is calculated for $\bf k$ on the Fermi surface, and ${\bf Q}=(\pm {\pi\over a}, \pm {\pi\over a})$. We find that the dimensionless ratio $|\delta\Lambda_{\bf k}|/\Lambda_\circ$, which parametrizes the vertex correction, is not small. It is a maximum for ${\bf k=k_h}$, where ${\bf k_h}$ is a ``hot spot'' on the Fermi surface. This makes large quantitative corrections to the theory.
Sharifzadeh Amin M. H.
Stamp P. E. C.
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