On the vertex corrections in antiferromagnetic spin fluctuation theories
Andrey V. Chubukov, Philippe Monthoux, Dirk K. Morr
Abstract
We argue that recent calculations by Amin and Stamp (PRL 77, 301 (1996); cond-mat/9601086) overestimate the strength of the vertex corrections in the spin-fermion model for cuprates. We clarify the physical origin of the apparent discrepancy between their results and earlier calculations. We also comment on the relative sign of the vertex correction.
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