TY - JOUR
T1 - Reinvestigation of dielectric anomalies of RMn2O5 associated with successive magnetic phase transitions
AU - Kobayashi, Satoru
AU - Osawa, Toshihiro
AU - Kimura, Hiroyuki
AU - Noda, Yukio
AU - Kagomiya, Isao
AU - Kohn, Kay
PY - 2005/1/1
Y1 - 2005/1/1
N2 - 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.
AB - 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.
KW - Dielectric constant
KW - Magnetic ordering
KW - Multiferroic
KW - RMnO
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M3 - Article
AN - SCOPUS:12944283022
VL - 46
SP - 289
EP - 291
JO - Journal of the Korean Physical Society
JF - Journal of the Korean Physical Society
SN - 0374-4884
IS - 1
ER -