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 language | English |
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Article number | 023707 |
Journal | journal of the physical society of japan |
Volume | 75 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2006 Feb |
Externally published | Yes |
Keywords
- CuRh O
- Geometrical magnetic frustration
- High-pressure synthesis
- Polymor phism
- Spinel structure
ASJC Scopus subject areas
- Physics and Astronomy(all)