Reinvestigation of simultaneous magnetic and ferroelectric phase transitions in YMn2O5

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

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75 Citations (Scopus)


Magnetic ordering around the ferroelectric transition temperature T C1 of weakly ferroelectric YMn2O5 has been reinvestigated by single-crystal neutron diffraction and dielectric measurements. Besides a two-dimensionally modulated incommensurate magnetic (2D-ICM) phase with the propagation vector q = (qx, 0, qz) and a lock-in commensurate magnetic (CM) one with q = (1/2, 0, 1/4) reported previously, we observed a 1D-ICM phase characterized by q = (qx, 0, 1/4) with qx∼ 0.492 that appears in a narrow temperature interval of ∼1 K and separates the 2D-ICM and CM phases. Corresponding to the 2D-ICM-to-1D-ICM and 1D-ICM-to-CM phase transitions at T = 40.8 K and 40.0 K, a sharp peak and a shoulder in the dielectric constant along the b-axis were detected. These results suggest that the ferroelectricity appears simultaneously with the magnetic phase transition from the 2D-ICM to 1D-ICM phase in YMn 2O5.

Original languageEnglish
Pages (from-to)1593-1596
Number of pages4
JournalJournal of the Physical Society of Japan
Issue number6
Publication statusPublished - 2004 Jun 1


  • Dielectric constant
  • Ferroelectricity
  • Magnetic phase transition
  • Neutron diffraction
  • YMnO

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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