High-pressure synthesis and magnetic properties of orthorhombic CuRh 2O 4

K. Ohgushi, H. Gotou, T. Yagi, Y. Ueda

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Polycrystals of orthorhombic CuRh 2U 4 were prepared by a solid state reaction under high pressure and its magnetic properties were compared with those of polymorph-tetragonal CuRh 2O 4 (spinel-type compound). The orthorhombic phase undergoes antiferromagnetic transition at 24 K. The ratio of the Curie-Weiss temperature (θ CW) to the Néel temperature (T N) is estimated to f = |θ CW|/T N = 2.6 and is considerably smaller than f in the tetragonal phase, 5.3. This indicates that geometrical magnetic frustration inherent in the Cu 2+ network of the spinel structure is released in the orthorhombic phase with lower crystal symmetry. We observed a weak ferromagnetism below T N in the orthorhombic phase; this is also discussed in terms of crystal symmetry.

Original languageEnglish
Article number023707
Journaljournal of the physical society of japan
Volume75
Issue number2
DOIs
Publication statusPublished - 2006 Feb
Externally publishedYes

Keywords

  • CuRh O
  • Geometrical magnetic frustration
  • High-pressure synthesis
  • Polymor phism
  • Spinel structure

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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