2006/10/04 by NATHAN WILSON, Wilson, N. R., O. A. Petrenko +3
Chemical Engineering · Environmental Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Catalysis and Oxidation Reactions #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Methane Hydrates and Related Phenomena
paper · pdf · doi:10.48550/arxiv.cond-mat/0610098
openalex publication_date 2006/10/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The low temperature properties of the Kagome-type system Co3V2O8 have been studied by powder neutron diffraction both in zero field and in applied magnetic field of up to 8 T. Below 6 K, the zero-field ground state is ferromagnetic with the magnetic moments aligned along the a-axis. The size of the moment on one of the two Co sites, the so called cross-tie site, is considerably reduced compared to the fully polarized state. The application of a magnetic field in this phase is found to rapidly enhance the cross-tie site magnetic moment, which reaches the expected value of ~3muB by the maximum applied field of 8 T. Different reorientation behaviors are found for the Co cross-tie and spine sites, suggesting a more pronounced easy-axis anisotropy for moments on the spine sites. Rietveld refinements reveal that a simple model, where the spins on both cross-tie and spine sites rotate in the ac-plane in a magnetic field, reproduces the experimental diffraction patterns well. In addition, it is found that at higher temperatures and moderate magnetic fields, the incommensurate antiferromagnetic order, corresponding to a transverse sinusoidal modulation above 8 K, is suppressed to be replaced by ferromagnetic order.