title: Origin of the enhanced copper spin echo decay rate in the pseudogap regime of the multilayer high-T(c) cuprates.
abstract: We report measurements of the anisotropy of the spin echo decay for the inner layer Cu site of the triple layer cuprate Hg(0.8)Re(0.2)Ba(2)Ca(2)Cu(3)O(8) (T(c)=126 K). The angular dependence of the second moment (T(-2)(2M) identical with <Deltaomega(2)>) deduced from the decay curves indicates that T(-2)(2M) for H0 parallel c is enhanced in the pseudogap regime below T(pg) approximately 170 K, as seen in bilayer systems. Comparison of T(-2)(2M) between H0 parallel c and H0 perpendicular c indicates that this enhancement is caused by electron spin correlations between the inner and the outer CuO2 layers. The results provide the answer to the long-standing controversy regarding the opposite T dependences of (T1T)(-1) and T(-2)(2G) (T(2G): Gaussian component) in the pseudogap regime of multilayer systems.
authors.affiliation: Department of Physics and Astronomy, University of California, Los Angeles, California 90095-1547, USA.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Goto
authors.forename: W G
authors.initials: WG
authors.lastname: Clark
authors.forename: Patrik
authors.initials: P
authors.lastname: Vonlanthen
authors.forename: Kenji B
authors.initials: KB
authors.lastname: Tanaka
authors.forename: Tadashi
authors.initials: T
authors.lastname: Shimizu
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Hashi
authors.forename: P V P S S
authors.initials: PV
authors.lastname: Sastry
authors.forename: Justin
authors.initials: J
authors.lastname: Schwartz