Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-06-12
Phys. Rev. B 59 (99) R685
Physics
Condensed Matter
Strongly Correlated Electrons
Final version, to appear. in Phys. Rev. B (Rapid Communications), sched. Jan. 99
Scientific paper
10.1103/PhysRevB.59.R685
We investigate the interplane magnetic coupling of the multilattice compound Y_2Ba_4Cu_7O_{15} by means of a bilayer Hubbard model with inequivalent planes. We evaluate the spin response, effective interaction and the intra- and interplane spin-spin relaxation times within the fluctuation exchange approximation. We show that strong in-plane antiferromagnetic fluctuations are responsible for a magnetic coupling between the planes, which in turns leads to a tendency of the fluctuation in the two planes to equalize. This equalization effect grows whit increasing in-plane antiferromagnetic fluctuations, i. e., with decreasing temperature and decreasing doping, while it is completely absent when the in-layer correlation length becomes of the order of one lattice spacing. Our results provide a good qualitative description of NMR and NQR experiments in Y_2Ba_4Cu_7O_{15}.
Arrigoni Enrico
Hanke Werner
Hildebrand G.
Schmalian Joerg
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