Interplane magnetic coupling effects in the multilattice compound Y_2Ba_4Cu_7O_{15}
Abstract
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}.
Keywords
Cite
@article{arxiv.cond-mat/9806155,
title = {Interplane magnetic coupling effects in the multilattice compound Y_2Ba_4Cu_7O_{15}},
author = {G. Hildebrand and E. Arrigoni and J. Schmalian and W. Hanke},
journal= {arXiv preprint arXiv:cond-mat/9806155},
year = {2009}
}
Comments
Final version, to appear. in Phys. Rev. B (Rapid Communications), sched. Jan. 99