Spin-bag mechanism of high-temperature superconductivity

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 ΔSDW 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-k' leads to a superconducting energy gap ΔSC which is nodeless over the Fermi surface, where Δ_SCΔ_SDWexp(-t/αU), with {α} of order unity.