Jun-ichiro KISHINE
[Physica C 282, 1771 (1997)]
We investigated spin fluctuations in magnetically coupled bilayer cuprates to elucidate anomalous behaviors of the low energy magnetic excitations in a metallic phase of them. We discussed the neutron scattering cross section and NMR relaxation rate of bilayer cuprates within a framework of the Fermi liquid theory. In conclusion, we showed the intra-layer spin fluctuations enhances the inter-layer coupling in a magnetically coupled bilayer cuprate, that causes the strong attraction for inter-layer spin singlet pair and repulsion for inter-layer spin triplet pair. This tendency leads to the dynamical screening of the total magnetic excitations in the low energy region. Thus so-called pseudo-spin-gap-anomaly can be realized in a magnetically coupled bilayer cuprate.