title: A frustrated ferrimagnet Cu5(VO4)2(OH)4 with a 1/5 magnetization plateau on a new spin-lattice of alternating triangular and honeycomb strips.
abstract: Cu5(VO4)2(OH)4 (turanite) is a layered compound, exhibiting a copper(II) oxide layer in the [0 1 1] plane composed of edge-sharing CuO6 octahedra. Each Cu-O layer is further separated by VO4 tetrahedra. Closer scrutiny found that the copper(II) oxide layer in the compound represents a totally new geometrically-frustrated lattice, a 1/6 depleted triangular lattice. More specifically, the spin network in the [0 1 1] plane is formed by the alternate ranking of triangular and honeycomb strips. Magnetic measurements show that the Cu5(VO4)2(OH)4 behaves as a spin-1/2 ferrimagnet with a Tc = ∼4.5 K. It exhibits an unusual 1/5 magnetization plateau arising from the competition between antiferromagnetic and ferromagnetic interactions caused by the strong frustration. The possible spin-arrangements are also suggested.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China.
authors.forename: Su-Yun
authors.initials: SY
authors.lastname: Zhang
authors.forename: Wen-Bin
authors.initials: WB
authors.lastname: Guo
authors.forename: Ming
authors.initials: M
authors.lastname: Yang
authors.forename: Ying-Ying
authors.initials: YY
authors.lastname: Tang
authors.forename: Mei-Yan
authors.initials: MY
authors.lastname: Cui
authors.forename: Nan-Nan
authors.initials: NN
authors.lastname: Wang
authors.forename: Zhang-Zhen
authors.initials: ZZ
authors.lastname: He