Abstract
We report on the phase transitions in the triangular lattice antiferromagnet CsFe(MoO4)2 at low temperatures and high pressure using powder neutron and X-ray diffraction, specific heat, magnetic susceptibility and in situ high pressure Raman measurements. CsFe(MoO4)2 undergoes a structural phase transition induced by the rotation of (MoO4)2− tetrahedra at Tc=220K. The transformation is associated with a symmetry decrease from P-3m to P-3. Below 4.5K the antiferromagnetic long range order appears that is related to the nuclear unit cell by the modulation vector q=(1/31/30.5). The system adopts ‘120°’ spiral spin structure that has been found in several triangular lattice multiferroics. Under pressure CsFe(MoO4)2 undergoes a reconstructive phase transition to a much larger superstructure which preserves the super-exchange interactions at low temperatures and allows an additional magnetic long-range order at T∼20K.
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