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Magnetic behaviour of layered Ag(II) fluorides

journal contribution
posted on 2023-06-08, 09:55 authored by Sylvia E McLain, Michelle R Dolgos, D Alan Tennant, John TurnerJohn Turner, Ted Barnes, Thomas Proffen, Brian C Sales, Robert I Bewley
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.

History

Publication status

  • Published

Journal

Nature Materials

ISSN

1476-1122

Publisher

Nature Publishing Group

Issue

7

Volume

5

Page range

561-566

Pages

6.0

Department affiliated with

  • Chemistry Publications

Notes

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.

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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