SPIN BAG MECHANISM OF HIGH TEMPERATURE SUPERCONDUCTIVITY
Mar 7, 1988
13 pages
Published in:
- Phys.Rev.Lett. 60 (1988) 10, 944
- Published: Mar 7, 1988
Report number:
- NSF-ITP-87-151
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Abstract: (APS)
A new approach to the theory of high-temperature superconductivity is proposed, based on the two-dimensional antiferromagnetic spin correlations observed in these materials over distances large compared to the lattice spacing. The spin ordering produces an electronic pseudogap {\ensuremath{\Delta}}_{\mathrm{SDW}} which is locally suppressed by the addition of a hole. This suppression forms a bag inside which the hole is self-consistently trapped. Two holes are attracted by sharing a common bag. The resulting pairing interaction {V}_{k\mathrm{\ensuremath{-}}k\mathcal{'}} leads to a superconducting energy gap {\ensuremath{\Delta}}_{\mathrm{SC}} which is nodeless over the Fermi surface, where {\ensuremath{\Delta}}_{\mathrm{SC}\mathrm{\ensuremath{\simeq}}{\ensuremath{\Delta}}_{\mathrm{SDW}\mathrm{exp}(\mathrm{\ensuremath{-}}\mathit{t}/\mathit{\ensuremath{\alpha}}\mathit{U}}}), with \ensuremath{\alpha} of order unity.References(0)
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