Charge frustration and dielectric dispersion in LuFe2O4

Naoshi Ikeda, Kay Kohn, Nobuyuki Myouga, Eri Takahashi, Hijiri Kitôh, Shunji Takekawa

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)

Abstract

We report the dielectric anomaries at the phase transitions of Lu(Fe2+ Fe3+)O4, which is considered as a charge and spin frustrated system. Dielectric constant shows a hump, just above the transition from the high temperature two-dimensional to the low temperature three-dimensional charge ordering. A few glassy behaviors were observed at this transition. The presence of spontaneous polarization in the low temperature phase was confirmed by the measurement of pyroelectricity. A step-wise increase of the dielectric constant with increasing temperature was observed between 150K and 250K as in other RFe2O4. These phenomena are explained by the presence of the polar domains with the ordering of Fe2+ and Fe3+ and the motions of the antiphase boundaries between them.

Original languageEnglish
Pages (from-to)1526-1532
Number of pages7
Journaljournal of the physical society of japan
Volume69
Issue number5
DOIs
Publication statusPublished - May 2000
Externally publishedYes

Keywords

  • Charge frustration
  • Charge ordering
  • Dielectric dispersion
  • Frustrated system
  • RFeO
  • Spontaneous polarization
  • Triangular lattice
  • Verwey transition

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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