ENHANCEMENT OF SUPERCONDUCTING CORRELATION DUE TO INTERLAYER TUNNELING

Interlayer single-particle tunneling between the Cu-O layers suppresse s the in-plane short-range magnetic order (which is modeled as spin de nsity wave (SDW) insulator). Doping over the SDW state kills perfect n esting of the Fermi surface (FS) in certain directions and hence the S DW gap reduces to zero in those directions of the FS. Coupling between the planes through interlayer tunneling (t(perpendicular to)) further suppresses the in-plane magnetic SDW gap. Superconductivity arises in the gapless regions of the FS under the ''modified spin-bag'' mechani sm. We show that the highest T-c can only be obtained for non-zero t(p erpendicular to) based on this mechanism.