Abstract
Polarization rotation of field-induced phase transformations was observed by means of a polarizing microscope on a (001)-cut single crystal $\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}{)}_{0.76}{\mathrm{Ti}}_{0.24}{\mathrm{O}}_{3}$ (PMNT24%) at room temperature with an electric field applied along the [001] direction. A hysteresis loop was also measured for comparison. As the electric field increases, polarizations of rhombohedral $R$ domains rotate toward the [001] tetragonal ${T}_{001}$ phase through ${M}_{A}$-type monoclinic distortions, i.e., $\stackrel{\ensuremath{\rightarrow}}{R}{M}_{A}\ensuremath{\rightarrow}{T}_{001}.$ The crystal cannot entirely reach the ${T}_{001}$ phase as the field approaches 44 kV/cm. In addition, spotlike domains that perhaps correspond to ${M}_{B}$-type monoclinic or triclinic phases were also observed. This field-induced phase transformation is strongly irreversible.
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