Abstract
In cuprate HTSCs, the DOS [1–4], Knight shift [5–7] and uniform susceptibility [8, 9] starts to decrease below \(T_0\sim 700\) K, corresponding to the growth of AF fluctuations. The weak pseudo-gap in the DOS is shallow and wide in energy. These “weak pseudo-gap behaviors” are reproducible in the FLEX approximation, although the obtained gap behaviors are rather moderate because of the fully self-consistent determination of the self-energy and the Green function. (The weak pseudo-gap in the DOS is prominent at the first iteration stage of the FLEX.) Mathematically, this too strong feedback effect in the fully self-consistent calculation should be canceled by the vertex correction in the self-energy.
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