Dielectric Relaxation and Hopping of Electrons in ErFe204

Naoshi Ikeda, Kay Kohn, Hijiri Kito, Jun Akimitsu, Kiiti Siratori

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

We report the frequency and the temperature dependence of the dielectric constant of polycrystalline ErFe2O4-δ with different degrees of oxygen deficiency S. a large dielectric relaxation, with the order of magnitude of 104 and nearly of the Debye type, is observed in the magnetically ordered states within the temperature and frequency ranges of 150 k to 290 K and 1 kHz to 3 MHz, respectively. The dispersion is larger in the sample with more oxygen deficiency. From the temperature dependence of the characteristic frequency, we conclude that the elementary process of the dispersion is related to electron hopping between Fe2+ and Fe3+ ions. a large value of the dielectric constant is consistent with the existence of spontaneous polarization in the magnetic phases of this oxide. We propose that the motion of the polarization domain boundaries is a determining factor of low-frequency dielectric constant.

Original languageEnglish
Pages (from-to)4556-4564
Number of pages9
Journaljournal of the physical society of japan
Volume63
Issue number12
DOIs
Publication statusPublished - Jan 1 1994
Externally publishedYes

Keywords

  • ErFe2O4
  • Verwey transition
  • dielectric relaxation
  • electron hopping
  • rare-earth oxide
  • two dimensional antiferromagnet

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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