title: Dominant ferromagnetism in the spin-1/2 half-twist ladder 334 compounds, Ba3Cu3In4O12 and Ba3Cu3Sc4O12.
abstract: The magnetic properties of polycrystalline samples of Ba(3)Cu(3)In(4)O(12) (In-334) and Ba(3)Cu(3)Sc(4)O(12) (Sc-334) are reported. Both 334 phases have a structure derived from perovskite, with CuO(4) squares interconnected to form half-twist ladders along the c-axis. The Cu-O-Cu angles, ~90°, and the positive Weiss temperatures indicate the presence of significant ferromagnetic (FM) interactions along the Cu ladders. At low temperatures, T < 20 K, sharp transitions in the magnetic susceptibility and heat capacity measurements indicate three-dimensional (3D) antiferromagnetic (AFM) ordering at T(N). T(N) is suppressed on application of a field and a complex magnetic phase diagram with three distinct magnetic regimes below the upper critical field can be inferred from our measurements. The magnetic interactions are discussed in relation to a modified spin-1/2 FM-AFM model and the 334 half-twist ladder is compared to other two-rung ladder spin-1/2 systems.
authors.affiliation: Department of Chemistry, Princeton University, Princeton, NJ 08544, USA. sed33@cam.ac.uk
authors.forename: S E
authors.initials: SE
authors.lastname: Dutton
authors.forename: M
authors.initials: M
authors.lastname: Kumar
authors.forename: Z G
authors.initials: ZG
authors.lastname: Soos
authors.forename: C L
authors.initials: CL
authors.lastname: Broholm
authors.forename: R J
authors.initials: RJ
authors.lastname: Cava