Field-induced polarization rotation in (001)-cut Pb(Mg1/3Nb2/3)0.76Ti0.24O3
Schmidt, V. Hugo
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Polarization rotation of field-induced phase transformations was observed by means of a polarizing microscope on a (001)-cut single crystal Pb(Mg1/3Nb2/3)0.76Ti0.24O3 (PMNT24%) at room temperature with an electric field applied along the  direction. A hysteresis loop was also measured for comparison. As the electric field increases, polarizations of rhombohedral R domains rotate toward the  tetragonal T001 phase through MA-type monoclinic distortions, i.e., R⃗ MA→T001. The crystal cannot entirely reach the T001 phase as the field approaches 44 kV/cm. In addition, spotlike domains that perhaps correspond to MB-type monoclinic or triclinic phases were also observed. This field-induced phase transformation is strongly irreversible.
R.R. Chien, V.H. Schmidt, C.-S. Tu, L.-W. Hung, and H. Luo, “Field-induced polarization rotation in (001)-cut Pb(Mg1/3Nb2/3)0.76Ti0.24O3,” Phys. Rev. B 69, 172101 (2004).