Magnetic bilayer coupling inYBa2Cu3O7

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Abstract
The spin-fluctuation spectrum of an extended t-J model appropriate to bilayer Y-Bu-Cu-O is investigated within a renormalized-mean-field approach. Strong antiferromagentic correlation between bilayers is found for realistic values of the interplane coupling in a regime where the in-plane susceptibility is strongly exchange enhanced even though the antiferromagentic correlation length is short. The influence of spin pairing on the spin-fluctuation spectrum, in this case via a d-wave order parameter, is included. The model predicts a strong energy dependence of the modulation in the vicinity of the characteristic energy for spin fluctuations.