Reinvestigation of magnetic structures for the thermally induced states of CuFe1-xAlxO2 (x = 0.00, 0.02 and 0.05) using a four-circle neutron diffractometer

Noriki Terada, Takeshi Kawasaki, Setsuo Mitsuda, Hiroyuki Kimura, Yukio Noda

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We have reinvestigated the effect of non-magnetic impurity on thermally-induced magnetic orderings in geometrically frustrated triangular lattice antiferromagnets CuFe1-xAlxO2 with x = 0.00, 0.02 and 0.05, using a four-circle neutron diffractometer. Although we inferred in our previous work with a three-axis diffractometer that a proper screw type magnetic structure is realized in the intermediate-temperature (IM) phase of the samples with x = 0.02 and x = 0.05, in the present work we found that a sinusoidally amplitude-modulated magnetic structure with the magnetic moments canted by about 50° from the c axis toward the hexagonal (110) direction is realized. These experimental findings suggest that the quasi-Ising magnetic orderings in CuFeO2 are stabilized not with the strong Ising anisotropy expected from the Ising-like successive magnetic phase transitions in CuFeO2 but with the small Ising anisotropy added to strongly competing exchange interactions.

Original languageEnglish
Pages (from-to)1561-1565
Number of pages5
Journaljournal of the physical society of japan
Volume74
Issue number5
DOIs
Publication statusPublished - 2005 May 1

Keywords

  • CuFeO
  • Four-circle diffractometer
  • Neutron diffraction
  • Spin frustration
  • Triangular lattice antiferromagnet

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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