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- W3131137042 abstract "The current thesis is dedicated to a complex neutron scattering study of magnetic behaviour cobalt-based tellurium (VI) spinel series doped with zinc. It was found that the parent compound may be obtained in two structural forms: disordered centrosymmetric (space group #227) and ordered non-centrosymmetric (space group #212). While the disordered polymorph is a typical Neel-type ferrimagnet with a magnetic transition at 40 K, the ordered polymorph possesses two incommensurate magnetic phase transitions at 45 K and 27 K. With a help of the superspace symmetry approach the spin structure of the ordered polymorph was found to be ferrimagnetic spiral. Both magnetic frustration and Dzyaloshinskii-Morya interaction stabilize such a magnetic ordering. The system shows stability of the magnetic structure against magnetic dilution, which occupies tetrahedral environment preferably: only when the half of A-sites is substituted with zinc the long range magnetic ordering is suppressed. Remarkably, both polymorphs demonstrate magnetic diffuse scattering far above long-range transition temperatures. Neutron XYZ polarization analysis revealed that in the case of the ordered polymorph the short-range ordering has the same ferrimagnetic spiral nature as the ordered state. Short-range ordering of the highly diluted ordered polymorph is similar to the parent compound. Dielectric spectroscopy of the disordered and ordered compound revealed magnetoelectric behaviour in each case." @default.
- W3131137042 created "2021-03-01" @default.
- W3131137042 creator A5072580130 @default.
- W3131137042 date "2020-12-17" @default.
- W3131137042 modified "2023-09-24" @default.
- W3131137042 title "Magnetoelectric coupling in cobalt-based tellurium (VI) oxides with complex spin structures" @default.
- W3131137042 hasPublicationYear "2020" @default.
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