Single-crystal investigations on the multiferroic materialLiFe(WO4)2
| Autor: | T. Fröhlich, X. Fabrèges, A. Bertin, Martin Meven, D. Gorkov, Ladislav Bohatý, D. Brüning, Markus Braden, S. Biesenkamp, Arsen Gukasov, Thomas Lorenz, Petra Becker |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review B. 103 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | The crystal and magnetic structures of multiferroic $\mathrm{LiFe}{({\mathrm{WO}}_{4})}_{2}$ were investigated by temperature and magnetic-field-dependent specific heat, susceptibility, and neutron diffraction experiments on single crystals. Considering only the two nearest-neighbor magnetic interactions, the system forms a ${J}_{1}, {J}_{2}$ magnetic chain, but more extended interactions are sizable. Two different magnetic phases exhibiting long-range incommensurate order evolve at ${T}_{\text{N}1}\ensuremath{\approx}22.2\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ and ${T}_{\text{N}2}\ensuremath{\approx}19\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. First, a spin-density wave develops with moments lying in the $ac$ plane. In its multiferroic phase below ${T}_{\text{N}2}, \mathrm{LiFe}{({\mathrm{WO}}_{4})}_{2}$ exhibits a spiral arrangement with an additional spin component along $b$. Therefore, the inverse Dzyaloshinskii-Moriya mechanism fully explains the multiferroic behavior in this material. A partially unbalanced multiferroic domain distribution was observed even in the absence of an applied electric field. For both phases only a slight temperature dependence of the incommensurability was observed, and there is no commensurate phase emerging at low temperature or at finite magnetic fields up to $6\phantom{\rule{0.16em}{0ex}}\mathrm{T}$. $\mathrm{LiFe}{({\mathrm{WO}}_{4})}_{2}$ thus exhibits a simple phase diagram with the typical sequence of transitions for a type-II multiferroic material. |
| Databáze: | OpenAIRE |
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