Polarization-Optical Domain Study of the Ferromagnetic/Ferroelectric/Ferroelastic Phase of Co3B7O13I

Abstract
Measurements of the spontaneous birefringence between 200 K to 10 K are reported. The symmetry of the ferromagnetic phases below 38 K is determined and consistent with Shubnikov point group m'm2'. A possible mechanism associated with the 28 K magnetic transition is proposed.

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