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

DOI: 10.1103/PhysRevB.79.045102 DOI Help

Authors: M. A. De Vries (École Polytechnique Fédérale de Lausanne) , T. K. Johal (Daresbury Laboratory) , A. Mirone (ESRF) , J. S. Claydon (University of Sheffield) , G. J. Nilson (École Polytechnique Fédérale de Lausanne) , H. M. Ronnow (École Polytechnique Fédérale de Lausanne) , A. Harrison (School of Chemistry, University of Edinburgh) , G. Van Der Laan (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 79 (4) , PAGES 045102

State: Published (Approved)
Published: January 2009

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.

Subject Areas: Physics

Instruments: NONE-No attached Diamond beamline

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