Volume 48, Number 2, October II 1999
|Page(s)||233 - 239|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Spin density on ligands and covalency of ions in octahedral sites of the garnet: A polarised neutron diffraction study
Petersburg Nuclear Physics Institute, RAS - Gatchina, St. Petersburg, 188350, Russia
2 Laboratoire Leon Brillouin - CE-Saclay, 911191 Gif-sur-Yvette Cedex, France
Accepted: 24 August 1999
By means of polarised neutron diffraction in an external magnetic field of at the covalent spin density is unambiguously observed on the ligands of the ions that occupy only the octahedral sites in the antiferromagnetic garnet. The maximum entropy method is used to reconstruct these spin density peaks. The moment value of the field-induced component is found by the least-squares refinement on the flipping ratios of the reflections affected only by oxygen. The ligand moment is determined to be by extrapolation of this component to the spin-flip (exchange) field. The corresponding reduction of the moment is 14(2)%. An impurity moment of in sites (probably 0.21% of ) can explain the partial magnetic disorder of this material.
PACS: 75.50.Ee – Antiferromagnetics / 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies synchrotron-source X-ray scattering, etc.) / 75.30.Et – Exchange and superexchange interactions
© EDP Sciences, 1999
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