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(Color online) (a) Electric field dependence of electric polarization at room temperature for the single crystal. Electric field was applied along the (100) direction through electrodes of silver paste. (b) Magnetic field dependence of magnetization at room temperature. Magnetic field was applied perpendicular to the (100) axis. (c) Experimental setup to detect optical magnetoelectric (OME) effect in emission of .
(Color online) (a) Emission spectra of the single crystal at room temperature, excited at . Intensity of emission is normalized by the maximum value at around . Inset shows the energy levels of and the relevant process of excitation, nonradiative transition, and emission. (b) OME spectra of at room temperature on the same normalization scale as the emission spectra (a). Filled and open circles represent component of applied magnetic field for and configurations, respectively. The component of is represented by the cross symbol (almost buried under the bare line). Magnetic field dependence of nonreciprocity at at room temperature is shown in the inset. The solid line represents the result of least square fitting.
(Color online) (a) OME spectra at at selected temperatures such as in the paraelectric phase , the ferroelectric phase with symmetry , the ferroelectric phase with symmetry , and the ferroelectric phase with symmetry. The solid and dashed lines are the guides for the eyes. (b) Temperature dependence of the peak intensity of at . (c) Temperature dependence of dielectric constant measured along the axis at and the magnetization at . The solid line for the data indicates the result of fitting with a formula of where is the Curie constant.
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