Abstract
We report the appearance of ferroelectricity below ${T}_{S}=18$ K, at which short-ranged spiral spin orders, suggesting that ${\mathrm{MnCr}}_{2}{\mathrm{O}}_{4}$ is an improper multiferroic material. Linear heat capacity data and zero-field-cooled memory effect verify reentrant spin-glass-like state below ${T}_{S}$. Synchrotron x-ray diffraction studies confirm significant magnetoelastic coupling at long-range ferrimagnetic order (${T}_{N}=42$ K) and at ${T}_{S}$. We argue that the release of topological spin frustration, produced due to pyrochlore structure of Cr sublattice, is manifested through the significant magnetoelastic effect at ${T}_{N}$ and ${T}_{S}$ and holds the key for spiral spin order driven ferroelectricity in ${\mathrm{MnCr}}_{2}{\mathrm{O}}_{4}$.
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