Article abstract


Nature Materials 5, 561 - 565 (2006)
Published online: 18 June 2006 | doi:10.1038/nmat1670

Subject Categories: Magnetic materials | Superconductors

Magnetic behaviour of layered Ag(II) fluorides

Sylvia E. McLain1,2, Michelle R. Dolgos2,9, D. Alan Tennant3,4, John F. C. Turner2, Ted Barnes5,6, Thomas Proffen7, Brian C. Sales8 & Robert I. Bewley1


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.

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  1. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK
  2. Department of Chemistry and Neutron Sciences Consortium, University of Tennessee, Knoxville, Tennessee 37996, USA
  3. Hahn-Meitner Institut, Glienicker Str. 100, Berlin D-14109, Germany
  4. School of Physics and Astronomy, University of St Andrews, St Andrews, Fife KY16 9SS, UK
  5. Department of Physics and Astronomy and Neutron Sciences Consortium, University of Tennessee, Knoxville, Tennessee 37996, USA
  6. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  7. LANSCE, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  8. Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  9. Present address: Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210, USA

Correspondence to: John F. C. Turner2 e-mail: jturner@ion.chem.utk.edu

Correspondence to: Ted Barnes5,6 e-mail: tbarnes@utk.edu

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