Magnetic behaviour of synthetic Co(2)SiO(4)

Acta Crystallographica. Section B, Structural Science
Andrew SazonovArsen Gukasov

Abstract

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 stu...Continue Reading

Citations

Mar 7, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·N V VolkovS I Popkov
Jul 22, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Franziska MuellerStefano Passerini
Jul 2, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Shivaraja IBasavaraj Angadi

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