Browsing by Author "Simonet, V"

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    The magnetic properties and structure of the quasi-two-dimensional antiferromagnet CoPS3
    (IOP Science, 2017-10-12) Wildes, AR; Simonet, V; Ressouche, E; Ballou, R; McIntyre, GJ
    The magnetic properties and magnetic structure are presented for CoPS3, a quasi-twodimensional antiferromagnet on a honeycomb lattice with a Néel temperature of TN ∼ 120 K. The compound is shown to have XY-like anisotropy in its susceptibility, and the anisotropy is analysed to extract crystal field parameters. For temperatures between 2K and 300K, no phase transitions were observed in the field-dependent magnetization up to 10 Tesla. Singlecrystal neutron diffraction shows that the magnetic propagation vector is k = (010) with the moments mostly along the a axis and with a small component along the c axis, which largely verifies the previously-published magnetic structure for this compound. The magnetic Bragg peak intensity decreases with increasing temperature as a power law with exponent 2β = 0.60 ± 0.01 for T > 0.9 TN. © 2017 IOP Publishing Ltd
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    Magnetic structure of the quasi-two-dimensional antiferromagnet NiPS 3
    (American Physical Society, 2015-12-07) Wildes, AR; Simonet, V; Ressouche, E; McIntyre, GJ; Avdeev, M; Suard, E; Kimber, SAJ; Lançon, D; Pepe, G; Moubaraki, B; Hicks, TJ
    The magnetic structure of the quasi-two-dimensional antiferromagnet NiPS3 has been determined by magnetometry and a variety of neutron diffraction techniques. The experiments show that the samples must be carefully handled, as gluing influences the magnetometry measurements while preferred orientation complicates the interpretation of powder diffraction measurements. Our global set of consistent measurements show numerous departures from previously published results. We show that the compound adopts a k = [010] antiferromagnetic structure with the moment directions mostly along the a axis, and that the paramagnetic susceptibility is isotropic. The critical behavior was also investigated through the temperature dependence of the magnetic Bragg peaks below the Néel temperature. ©2015 American Physical Society