Abstract
Pseudogap phenomena in high- T c cuprates are examined. The effective action for 2D electron systems with antiferromagnetic (AFM) and d x 2− y 2 -wave superconducting (dSC) fluctuations is considered. By the SCR (self-consistent renormalization), the spin and the pairing correlation lengths, ξ σ and ξ d, and 1/ T 1 T are calculated. The pseudogap (PG) emerges when dSC short-range order (SRO) dominates over AFM-SRO. When damping for the spin wave strongly depends on ξ d through the formation of precursor singlets around (π, 0) and (0, π) points, the spin PG in underdoped cuprates is reproduced. Otherwise, the PG region shrinks as in overdoped cuprates.
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