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The cubic spinel FeCr2S4 has been receiving immense research interest becauseof its emergent phases and the interplay of spin, orbital and lattice degreesof freedom. Despite the intense research, several fundamental questions are yetto be answered, such as the refinement of the crystal structure in thedifferent magnetic and orbital ordered phases. Here, using high-resolutionsynchrotron powder diffraction on stoichiometric crystals of FeCr2S4 weresolved the long sought-after cubic to tetragonal transition at ~65 K,reducing the lattice symmetry to I41/amd. With further lowering thetemperature, at ~9 K, the crystal structure becomes polar, hence the compoundbecomes multiferroic. The elucidation of the lattice symmetry throughoutdifferent phases of FeCr2S4 provides a basis for the understanding thisenigmatic system and also highlights the importance of structural deformationin correlated materials.

Resolving structural changes and symmetry lowering in spinel FeCr2S4