Reinvestigation of dielectric anomalies of RMn2O5 associated with successive magnetic phase transitions

Satoru Kobayashi, Toshihiro Osawa, Hiroyuki Kimura, Yukio Noda, Isao Kagomiya, Kay Kohn

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)289-291
Number of pages3
JournalJournal of the Korean Physical Society
Volume46
Issue number1
Publication statusPublished - 2005 Jan 1

Keywords

  • Dielectric constant
  • Magnetic ordering
  • Multiferroic
  • RMnO

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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