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Magnetic ordering in CocMg1-cO solid solutions
Mironova-Ulmane N.1, Ulmanis U.1, Kuzmin A.1, Sildos I.2, Pars M.2, Cestelli Guidi M.3, Piccinini M.3,4, Marcelli A.3
1Institute of Solid State Physics, University of Latvia, L Riga, Latvia
2Institute of Physics, University of Tartu, Tartu, Estonia
3Laboratory Nazionali di Frascati, Instituto Nazionale di Fisica Nucleare, Frascati, Italy
4Dipartimento di Scienze Geologiche, Universita Roma Tre, Roma, Italy
Выставление онлайн: 20 августа 2008 г.

The influence of dilution by diamagetic ions on the magnetic ordering in single-crystal CocMg1-cO solid solutions was studied by Raman spectroscopy and magneto-optical microscopy in a wide range of temperatures (6<T<200 K). Far infra-red absorption measurements of antiferromagnetic resonance (AFMR) were also performed for pure CoO. It was found that the domain structure and the contribution from Brillouin zone center magnons to Raman scattering and AFMR disappear well below the Neel temperature, determined by neutron diffraction and magnetic susceptibility measurements. This work was supported by the Latvian Government grants (N 05.1718 and 05-1717), the Estonian Science Foundation grant (N 5864) and the EU TARI "EDAAM" project under the contract RII3-CT-2004-506078. PACS: 75.25.+z, 75.50.Ee, 78.30.-j
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