Field dependence of magnetic ordering in Kagome-staircase compound Ni3V2O8

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Title: Field dependence of magnetic ordering in Kagome-staircase compound Ni3V2O8
Author: Kenzelmann, M.; Harris, A.B.; Aharony, A.; Entin-Wohlman, O.; Yildirim, T.; Huang, Q.; Park, S.; Lawes, G.; Broholm, C.; Rogado, N.; Cava, R.J.; Kim, K.H.; Jorge, G.; Ramirez, A.P.
Abstract: 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.
Date: 2006-07-01
Citation: Source: Physical Review B (Condensed Matter and Materials Physics) 1 July 2006, vol.74, no.1, pp. 14429-1-26
Subject: 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

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