ФТТ, 2008, том 50, выпуск 9

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Magnetic ordering in CocMg1-cO solid solutions

N.Mironova-Ulmane, U.Ulmanis, A.Kuzmin, I.Sildos\kern1pt*,
M.Pars\kern1pt*, M.Cestelli Guidi\kern1pt**, M.Piccinini\kern1pt**,***, A.Marcelli\kern1pt**

Institute of Solid State Physics, University of Latvia,
LV-1063 Riga, Latvia
* Institute of Physics, University of Tartu,
EE-2400 Tartu, Estonia
** Laboratory Nazionali di Frascati, Instituto Nazionale di Fisica Nucleare,
Frascati, Italy
*** Dipartimento di Scienze Geologiche, Universita Roma Tre,
Roma, Italy

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 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 \glqq EDAAM\grqq project under the contract RII3-CT-2004-506078.

PACS: 75.25.+z, 75.50.Ee, 78.30.-j

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