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VOLUME 59 | ISSUE 1 | PAGE 65
Theory of the spin gap in bilayer cuprates
A model of two planes of antiferromagnetically correlated electrons coupled together by a weak antiferromagnetic interaction of strength has been formulated and solved. It is shown that in-plane antiferromagnetic correlations dramatically enhance the pairing effect of the interplane interaction. For the case in which the in-plane correlation length ~~ is ~ T~b we find that the interaction λ leads to spin pairing at a temperature Τ*~λ much higher than the usual BCS result, exp( —J/λ). We suggest that this is a possible explanation of the spin-gap effects observed below T*~ 150 in YBa2Cu306 6.




Permission given by American Institute of Physics is appreciated.