Determination of the single-ion anisotropy energy in a S = 5/2 kagome antiferromagnet using x-ray absorption spectroscopy

Mark A. de Vries, Tarnjit Johal, Alessandro Mirone, Jill Claydon, G. J. Nilsen, H. M. Ronnow, Andrew Harrison

Research output: Contribution to journalArticlepeer-review

Abstract

We report x-ray absorption and x-ray linear dichroism measurements at the Fe L2,3 edges of the geometrically frustrated systems of potassium and hydronium iron jarosite. Comparison with simulated spectra, involving ligand-field multiplet calculations modeling the 3d-2p hybridization between the iron ion and the oxygen ligands, has yielded accurate estimates for the ligand metal-ion hybridization and the resulting single-ion crystal-field anisotropy energy. Using this method we provide an experimentally verified scenario for the appearance of a single-ion anisotropy in this nominally high-spin 3d5 orbital singlet 6S system, which accounts for features of the spin-wave dispersion in the long-range-ordered ground state of potassium iron jarosite.
Original languageEnglish
Article number045102
Pages (from-to)1-9
Number of pages9
JournalPhysical review B: Condensed matter and materials physics
Volume79
Issue number4
DOIs
Publication statusPublished - 6 Jan 2009

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