title: Crossover from dilute to majority spin freezing in two leg ladder system Sr(Cu,Zn)2O3
abstract: Muon spin relaxation has been measured in Sr(Cu1-xZnx)2O3. The results for low Zn concentration x</=0.6% are consistent with freezing of dilute moments, with one Cu spin for each Zn, having approximately 0.5&mgr;(B) frozen moment. A sharp increase of the relaxation rate at T-->0 occurred with increasing x around x approximately 0.8%, accompanied by a change of line shape to that expected in a concentrated magnetic environment. Analyses of the results for x>/=0.8% suggest that the majority of Cu moments participate in spin freezing, yet with a significantly reduced and spatially inhomogeneous moment size having a 1D correlation length xi approximately 6 lattice units, or a 2D correlation area involving approximately 19 Cu spins.
authors.affiliation: Physics Department, Columbia University, New York, New York 10027, USA.
authors.initials: MI
authors.lastname: Larkin
authors.initials: Y
authors.lastname: Fudamoto
authors.initials: IM
authors.lastname: Gat
authors.initials: A
authors.lastname: Kinkhabwala
authors.initials: KM
authors.lastname: Kojima
authors.initials: GM
authors.lastname: Luke
authors.initials: J
authors.lastname: Merrin
authors.initials: B
authors.lastname: Nachumi
authors.initials: YJ
authors.lastname: Uemura
authors.initials: M
authors.lastname: Azuma
authors.initials: T
authors.lastname: Saito
authors.initials: M
authors.lastname: Takano