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American Physical Society, Physical review B, 4(79), 2009

DOI: 10.1103/physrevb.79.045102

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Determination of the single-ion anisotropy energy in aS=52kagome antiferromagnet using x-ray absorption spectroscopy

Journal article published in 2009 by M. A. de Vries, T. K. Johal, A. Mirone, J. S. Claydon, G. J. Nilsen, H. M. Rønnow, G. van der Laan ORCID, A. Harrison
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Abstract

We report x-ray absorption and x-ray linear dichroism measurements at the FeL2,3 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 S6 system, which accounts for features of the spin-wave dispersion in the long-range-ordered ground state of potassium iron jarosite.