High-field magnetism of the S = 5/2 triangular-lattice antiferromagnet CuFe1-xGaxO2 (x = 0.-0.028)

Takahito Fujita, Shojiro Kimura, Takanori Kida, Takahiro Kotetsu, Masayuki Hagiwara

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We have performed multifrequency electron spin resonance (ESR), electric polarization, and magnetization measurements on single crystals of the triangular-lattice antiferromagnet CuFe1-xGaxO2 (x = 0.000-0.028) in high magnetic fields. We compared ESR results with the other results (electric polarization and magnetization measurements) to clarify the origin of the expansion of a ferroelectric and incommensurate (FEIC) phase induced by the doping of nonmagnetic Ga3+ ions. We observed a rapid increase in the ESR linewidth and a large shift of the transition field from a four-sublattice collinear phase to the FEIC phase accompanied with a magnetization jump and a spontaneous electric polarization with slight doping of Ga3+ ions. We have found that the ESR linewidth is highly correlated with this shift. As a result, we have succeeded in explaining the origin of the expansion of the FEIC phase as well as the change of the transition field induced by broadening of the lowest excitation branch with an increase in Ga content.

Original languageEnglish
Article number064712
Journaljournal of the physical society of japan
Volume82
Issue number6
DOIs
Publication statusPublished - 2013 Jun

Keywords

  • Electric polarization
  • Esr
  • Frustrated magnetic system
  • Magnetization
  • Triangular-lattice antiferromagnet

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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