High-Pressure Synthesis and Magnetic Properties of Orthorhombic CuRh2O4
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Polycrystals of orthorhombic CuRh<SUB>2</SUB>O<SUB>4</SUB> were prepared by a solid state reaction under high pressure and its magnetic properties were compared with those of polymorph–tetragonal CuRh<SUB>2</SUB>O<SUB>4</SUB> (spinel-type compound). The orthorhombic phase undergoes antiferromagnetic transition at 24 K. The ratio of the Curie–Weiss temperature (θ<SUB>CW</SUB>) to the Néel temperature (<I>T</I><SUB>N</SUB>) is estimated to be <I>f</I>=|θ<SUB>CW</SUB>|⁄<I>T</I><SUB>N</SUB>=2.6 and is considerably smaller than <I>f</I> in the tetragonal phase, 5.3. This indicates that geometrical magnetic frustration inherent in the Cu<SUP>2+</SUP> network of the spinel structure is released in the orthorhombic phase with lower crystal symmetry. We observed a weak ferromagnetism below <I>T</I><SUB>N</SUB> in the orthorhombic phase; this is also discussed in terms of crystal symmetry.
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