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Satoru Kobayashi,Hiroyuki Kimura,Isao Kagomiya,Kay Kohn,Toshihiro Osawa,Yukio Noda 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
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 1 K around TC1 by neutron diraction 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.