2D-to-1D modulated-to-lock in successive magnetic phase transitions associated with ferroelectricity in ErMn2O5

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

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

We report results of dielectric and neutron diffraction measurements in zero field on magnetic ordering of weakly ferroelectric ErMn2O 5. Around the ferroelectric transition temperature of TC1 ∼ 38 K below TN1 = 44 K, we observed successive magnetic phase transitions from a two-dimensionally-modulated (2D) incommensurate magnetic (ICM) phase with the propagation vector q = (qx, 0, qz) to another 1D-ICM one with q = (qx, 0, 1/4) at T = 39.1 K, and then to a commensurate magnetic (CM) phase with q = (1/2, 0, 1/4) at T = 37.7 K. These two magnetic phase transitions (39.1 K and 37.7K) were found to be associated with an anomaly in the dielectric constant along the b axis. In addition, we found that in the case of a rapid-cooling procedure a low-temperature ICM state characterized by q = (1/2, 0, 0.265) shows up and coexists with the CM phase below TN2 = 11.5 K where evolution of magnetic order of the Er ions is inferred from measurements of the magnetoelectric effect. These observations indicate the strong coupling between ferroelectricity and magnetic orderins in this system.

Original languageEnglish
Pages (from-to)1031-1035
Number of pages5
Journaljournal of the physical society of japan
Volume73
Issue number4
DOIs
Publication statusPublished - 2004 Apr 1

Keywords

  • ErMnO
  • Ferroelectricity
  • Neutron diffraction
  • Successive magnetic phase transitions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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