title: Low-dimensional ferromagnetic properties of SrCuV2O7 and BaCuV2O7.
abstract: The crystal structure of isostructural SrCuV(2)O(7) and BaCuV(2)O(7) consists of one-dimensional (1D) zigzag chains of Cu atoms with next-nearest-neighbor interaction. The main intrachain interaction was found to be ferromagnetic and estimated at 4.6 K (Hamiltonian H approximately -2J). SrCuV(2)O(7) and BaCuV(2)O(7) are new examples in the scanty family of 1D ferromagnets. Isothermal magnetization measurements at 0.08 K and specific heat data showed that MCuV(2)O(7) exhibits antiferromagnetic long-range ordering at T(N) = 1.36 K for SrCuV(2)O(7) and T(N) = 1.47 K for BaCuV(2)O(7). Spin-flop transitions were observed in the antiferromagnetic state at 0.08 K near 0.5 kOe in SrCuV(2)O(7) and 2 kOe in BaCuV(2)O(7). In air, SrCuV(2)O(7) and BaCuV(2)O(7) melted incongruently above 983 and 1018 K, respectively.
authors.affiliation: Institute for Chemical Research, Kyoto University, Uji, Japan. Alexei.BELIK@nims.go.jp
authors.forename: Alexei A
authors.initials: AA
authors.lastname: Belik
authors.forename: Masaki
authors.initials: M
authors.lastname: Azuma
authors.forename: Akira
authors.initials: A
authors.lastname: Matsuo
authors.forename: Koichi
authors.initials: K
authors.lastname: Kindo
authors.forename: Mikio
authors.initials: M
authors.lastname: Takano