dx2-y2 wave pairing fluctuations and pseudo spin gap in two-dimensional electron systems

Shigeki Onoda*, Masatoshi Imada


研究成果: Article査読

22 被引用数 (Scopus)


Pseudogap phenomena of high-Tc cuprates are examined. In terms of AFM (antiferromagnetic) and dSC (dx2-y2-wave superconducting) auxiliary fields introduced to integrate out the fermions, the effective action for 2D electron systems with AFM and dSC fluctuations is considered. By the self-consistent renormalization (SCR), the NMR relaxation rate T1-1, the spin correlation length ξσ and the pairing correlation length ξd are calculated. From this calculation, a mechanism of the pseudogap formation emerges as the region of dominant d-wave short-range order (SRO) over AFM-SRO. When damping for the AFM fluctuation strongly depends on the dSC correlation length through the formation of precursor singlets around (π, 0) and (0, π) points in the momentum space, the pseudogap appears in a region of the normal state characterized by decreasing 1/T1T and increasing AFM correlation length with decrease in temperature. This reproduces a characteristic feature of the pseudogap phenomena in many underdoped cuprates. When the damping becomes insensitive to the dSC correlation length, the pseudogap region shrinks as in the overdoped cuprates.

ジャーナルjournal of the physical society of japan
出版ステータスPublished - 1999 8月

ASJC Scopus subject areas

  • 物理学および天文学(全般)


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