Field dependence of magnetic ordering in Kagome-staircase compound Ni3V2O8

We present powder and single-crystal neutron diffraction and bulk measurements of the Kagome-staircase compound Ni3V2O8 (NVO) in fields up to 8.5 T applied along the c direction. (The Kagome plane is the a-c plane.) This system contains two types of Ni ions, which we call 'spine' and 'cross-tie.' Our neutron measurements can be described with the paramagnetic space group Cmca for T<15 K and each observed magnetically ordered phase is characterized by the appropriate irreducible representation(s). Our zero-field measurements show that at TPH=9.1 K NVO undergoes a transition to a predominantly longitudinal incommensurate structure in which the spine spins are nearly along the a-axis. At THL=6.3 K, there is a transition to an elliptically polarized incommensurate structure with both spine and cross-tie moments in the a-b plane. At TLC=4 K the system undergoes a first-order phase transition to a commensurate antiferromagnetic structure with the staggered magnetization primarily along the a-axis and a weak ferromagnetic moment along the c-axis. A specific heat anomaly at TCC'=2.3 K indicates an additional transition, which remarkably does not affect Bragg peaks of the commensurate C structure. Neutron, specific heat, and magnetization measurements produce a comprehensive temperature-field phase diagram. The symmetries of the incommensurate magnetic phases are consistent with the observation that only one phase is electrically polarized. The magnetic structures are explained theoretically using a simplified model Hamiltonian, that involves competing nearest- and next-nearest-neighbor exchange interactions, single-ion anisotropy, pseudodipolar interactions, and Dzyaloshinskii-Moriya interactions.
simplified model Hamiltonian, temperature-field phase diagram, Bragg peaks, cross-tie moments, longitudinal incommensurate structure, appropriate irreducible representation, Kagome-staircase compound, magnetic ordering, weak ferromagnetism, pseudodipolar interactions, specific heat, space groups, nickel compounds, neutron diffraction, magnetic transitions, magnetic moments, exchange interactions (electron), commensurate-incommensurate transformations, antiferromagnetic materials, Dzyaloshinskii-Moriya interaction, Ni3V2O8
Source: Physical Review B (Condensed Matter and Materials Physics) 1 July 2006, vol.74, no.1, pp. 14429-1-26