Magnetic behaviour of layered Ag(II) fluorides

McLain, Sylvia E, Dolgos, Michelle R, Tennant, D Alan, Turner, John F C, Barnes, Ted, Proffen, Thomas, Sales, Brian C and Bewley, Robert I (2006) Magnetic behaviour of layered Ag(II) fluorides. Nature Materials, 5 (7). pp. 561-566. ISSN 1476-1122

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Abstract

Fluoride phases that contain the spin-1/2 4d¿9 Ag(II) ion have recently been predicted to have interesting or unusual magnetochemistry, owing to their structural similarity to the 3d¿9 Cu(II) cuprates and the covalence associated with this unusual oxidation state of silver. Here we present a comprehensive study of structure and magnetism in the layered Ag(II) fluoride Cs2AgF4, using magnetic susceptometry, inelastic neutron scattering techniques and both X-ray and neutron powder diffraction. We find that this material is well described as a two-dimensional ferromagnet, in sharp contrast to the high-TC cuprates and a previous report in the literature. Analyses of the structural data show that Cs2AgF4 is orbitally ordered at all temperatures of measurement. Therefore, we suggest that orbital ordering may be the origin of the ferromagnetism we observe in this material.

Item Type: Article
Additional Information: Detailed characterisation of the structure and magnetisation of a rare 2D Heisenberg ferromagnet using X-ray and neutron diffraction, scattering and SQUID magnetometry. Highlighted in News and Views in Nature Materials, International collaboration between JFCT and TB, JFCT directed the project and is joint corresponding author.
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: John Turner
Date Deposited: 06 Feb 2012 21:24
Last Modified: 30 Mar 2012 11:03
URI: http://sro.sussex.ac.uk/id/eprint/31117
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