Theory of the Spin Gap in High Temperature Superconductors
B. L. Altshuler, L. B. Ioffe, A. J. Millis
Abstract
We analyze pairing in two dimensional spin liquids. We argue that interplane pairing enhanced by magnetic correlations is the most plausible explanation of the spin gap phenomenon observed in underdoped cuprates. The details of the pairing theory depend on the in-plane antiferromagnetic correlations. We consider two models: 2pF correlations induced by a strong gauge field interaction and undamped spin waves. We estimate the pairing temperature Ts and the angular dependence of the gap function and discuss physical consequences.
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