| Issue |
Europhys. Lett.
Volume 48, Number 2, October II 1999
|
|
|---|---|---|
| Page(s) | 233 - 239 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1999-00471-9 | |
| Published online | 01 September 2002 | |
Spin density on ligands 
and covalency of 
ions in octahedral sites of the 
garnet:
A polarised neutron diffraction study
1
Petersburg Nuclear Physics Institute, RAS - Gatchina, St. Petersburg, 188350, Russia
2
Laboratoire Leon Brillouin - CE-Saclay, 911191 Gif-sur-Yvette Cedex, France
Received:
31
May
1999
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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