title: Dynamics of the frustrated spin in the low dimensional magnet Co₃(OH)₂(C₄O₄)₂.
abstract: We describe powder inelastic neutron scattering experiments on a porous coordination polymer Co3(OH)2(C4O4)2, which has two different ordered magnetic phases known to display spin frustrated behaviour, resulting in an idle-spin phase. The moment on each ion is represented by an effective total angular moment J(eff ) =  ½. A non-dispersive magnetic mode was observed in the idle-spin phase which is described by a simple dimer model that assumes ΔJ  =  0. The excitation was found to persist well above the long range ordering temperature into the paramagnetic region. A combination of frustration, the J(eff)  =  ½ and low dimensionality may induce these quantum phenomena.
authors.affiliation: Australian Nuclear Science and Technology Organisation, Locked bag 2001, Kirrawee DC, NSW 2232, Australia. Department of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
authors.forename: Richard A
authors.initials: RA
authors.lastname: Mole
authors.forename: Kirrily C
authors.initials: KC
authors.lastname: Rule
authors.forename: Dehong
authors.initials: D
authors.lastname: Yu
authors.forename: John A
authors.initials: JA
authors.lastname: Stride
authors.forename: M Arif
authors.initials: MA
authors.lastname: Nadeem
authors.forename: Paul T
authors.initials: PT
authors.lastname: Wood