Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-08-14
Physics
Condensed Matter
Strongly Correlated Electrons
minor changes in text, captions and table 1. Accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.79.045102
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 modelling 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.
Claydon J. S.
de Vries Mark A.
der Laan van G.
Harrison Albert A.
Johal T. K.
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