A ferroelectric phase transition of RMn2O5 (R = rare earth, Bi, Y) has been systematically reinvestigated by dielectric measurements. In addition to a sharp peak of the dielectric constant along the b axis at the temperature of ferroelectric phase transition, TC1, we observed a small kink at TS slightly below TC1 for R. = Er, Y, Tb, Tm. Correspondingly, two-step successive magnetic phase transitions were found for R. = Er, Y, Tm in a narrow temperature range of l K around TC1 by neutron diffraction measurements. The comparison between temperatures of dielectric anomalies and magnetic phase transitions indicates that the paraelectric-ferroelectric phase transition at TC1 is induced by a commensurate magnetic ordering along the c axis in RMn2O5.
|Number of pages||3|
|Journal||Journal of the Korean Physical Society|
|Publication status||Published - 2005 Jan 1|
- Dielectric constant
- Magnetic ordering
ASJC Scopus subject areas
- Physics and Astronomy(all)