title: Saturation field of frustrated chain cuprates: broad regions of predominant interchain coupling.
abstract: A thermodynamic method to extract the interchain coupling (IC) of spatially anisotropic 2D or 3D spin-1/2 systems from their empirical saturation field H(s) (T=0) is proposed. Using modern theoretical methods we study how H(s) is affected by an antiferromagnetic (AFM) IC between frustrated chains described in the J(1)-J(2)-spin model with ferromagnetic 1st and AFM 2nd neighbor in-chain exchange. A complex 3D-phase diagram has been found. For Li(2)CuO(2) and Ca(2)Y(2)Cu(5)O(10), we show that H(s) is solely determined by the IC and predict H(s)≈61 T for the latter. With H(s)≈55 T from magnetization data one reads out a weak IC for Li(2)CuO(2) close to that obtained from inelastic neutron scattering.
authors.affiliation: IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Nishimoto
authors.forename: S-L
authors.initials: SL
authors.lastname: Drechsler
authors.forename: R O
authors.initials: RO
authors.lastname: Kuzian
authors.forename: J
authors.initials: J
authors.lastname: van den Brink
authors.forename: J
authors.initials: J
authors.lastname: Richter
authors.forename: W E A
authors.initials: WE
authors.lastname: Lorenz
authors.forename: Y
authors.initials: Y
authors.lastname: Skourski
authors.forename: R
authors.initials: R
authors.lastname: Klingeler
authors.forename: B
authors.initials: B
authors.lastname: Büchner