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Pressure-induced phase transitions in multiferroic RbFe(MoO4)2—Raman scattering study |
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| Authors: | M M?czka M Ptak C Luz-Lima PTC Freire W Paraguassu S Guerini J Hanuza |
| Institution: | aInstitute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroc?aw 2, Poland;bDepartamento de Física, Universidade Federal do Ceara, Fortaleza, Ceara, Brazil;cFaculdade de Física, Universidade Federal do Pará, 66075-110 Belém, PA, Brazil;dDepartamento de Fisica, Universidade Federal do Maranhão, São Luis-MA 65085-580, Brazil;eDepartment of Bioorganic Chemistry, University of Economics, 53-345 Wroclaw, Poland |
| Abstract: | High pressure Raman scattering experiments were performed on RbFe(MoO4)2. These experiments revealed that two phase transitions take place in RbFe(MoO4)2 at very low pressures, i.e. between ambient pressure and 0.2 GPa and between 0.4 and 0.7 GPa. Raman results showed that at the first phase transition the room temperature P3?m1 phase transforms into the P3? phase, which is also observed at ambient pressure below 190 K. The second pressure-induced phase transition occurs into a low symmetry phase of unknown symmetry. The performed lattice dynamics calculations for the P3?m1 phase and ab initio calculation of the structural changes under hydrostatic pressure helped us to get better insights into the mechanism of the observed phase transitions. |
| Keywords: | Lattice dynamics High pressure Phase transitions |
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