Simultaneous measurements of magnetic neutron diffraction, electrical polarization and permittivity of multiferroic ErMn2O5

Mamoru Fukunaga, Keisuke Nishihata, Hiroyuki Kimura, Yukio Noda, Kay Kohn

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In order to determine an exact relationship between magnetic ordering and ferroelectricity in multiferroic rare-earth manganese oxides, we have performed simultaneous measurements of neutron diffraction, ferroelectric D-E hysteresis loops and the permittivity ε of ErMn2O5 down to 2.5 K. Special attention was paid to the area around the ferroelectric phase transition temperature. In contrast to previous expectations based on separate measurements, the peak of ε was found to coincide with a magnetic incommensurate-commensurate phase transition. However, it was confirmed that electrical polarization appears at the transition to a one-dimensionally incommensurate magnetic phase, which is higher than the peak of ε by 1.2 K. A previously unknown low-temperature incommensurate magnetic phase of ErMn 2O5 below 8K was found. The lowest-temperature phase appears to be paraelectric according to the D-E loops, while pyroelectric measurements show that the phase exhibits a small polarization.

Original languageEnglish
Article number074710
Journaljournal of the physical society of japan
Volume76
Issue number7
DOIs
Publication statusPublished - Jul 1 2007

Keywords

  • D-E hysteresis
  • ErMnO
  • Multiferroic
  • Neutron diffraction
  • Polarization

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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