Magnetic excitations in Co2SiO4

Schmidt, W.; Brotzeller, C.; Schweiß, P.; Tietze-Jaensch, H.; Geick, R.; Treutmann, W.

doi:10.1016/0304-8853(94)01222-9

Cited by 6 publications

(1 citation statement)

References 2 publications

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“…Therefore, the ordering with decreasing temperature evolves with almost the same velocity for the two magnetic sublattices, although they end up with different resultant magnetic moments per ion. The non-zero values of the parameter h are in agreement with the magnetic pre-ordering in Co 2 SiO 4 above the Né el temperature, observed by means of the magnetic excitations measurements with neutron scattering (Schmidt et al, 1995).…”

Section: Tablesupporting

confidence: 85%

Magnetic behaviour of synthetic Co₂SiO₄

Sazonov

Meven

Hutanu

et al. 2009

Acta Crystallogr Sect B

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Synthetic Co(2)SiO(4) crystallizes in the olivine structure (space group Pnma) with two crystallographically non-equivalent Co positions and shows antiferromagnetic ordering below 50 K. We have investigated the temperature variation of the Co(2)SiO(4) magnetic structure by means of non-polarized and polarized neutron diffraction for single crystals. Measurements with non-polarized neutrons were made at 2.5 K (below T(N)), whereas polarized neutron diffraction experiments were carried out at 70 and 150 K (above T(N)) in an external magnetic field of 7 T parallel to the b axis. Additional accurate non-polarized powder diffraction studies were performed in a broad temperature range from 5 to 500 K with small temperature increments. Detailed symmetry analysis of the Co(2)SiO(4) magnetic structure shows that it corresponds to the magnetic (Shubnikov) group Pnma, which allows the antiferromagnetic configuration (G(x), C(y), A(z)) for the 4a site with inversion symmetry 1 (Co1 position) and (0,C(y),0) for the 4c site with mirror symmetry m (Co2 position). The temperature dependence of the Co1 and Co2 magnetic moments obtained from neutron diffraction experiments was fitted in a modified molecular-field model. The polarized neutron study of the magnetization induced by an applied field shows a non-negligible amount of magnetic moment on the oxygen positions, indicating a delocalization of the magnetic moment from Co towards neighbouring O owing to superexchange coupling. The relative strength of the exchange interactions is discussed based on the non-polarized and polarized neutron data.

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Section: Tablesupporting

confidence: 85%