Journal
PHYSICAL REVIEW B
Volume 79, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.014412
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Delafossite antiferromagnetic oxide CuCrO2 was investigated by means of neutron powder diffraction versus temperature. Evolution of the structural parameters (in the R (3) over barm hexagonal setting) shows a steady decrease in the a lattice parameter but negative thermal expansion along c as the temperature decreases from 300 to 1.5 K. Below T-N=24 K, both a and c become constant and a relaxation of the rhombohedral distortion of the CrO6 octahedra is observed. The magnetic structure of CuCrO2 is noncommensurate and shows a short magnetic correlation length of about 200 angstrom along c. Symmetry analysis considerations allow us to propose two possible magnetic structures, helicoidal or cycloidal, compatible with ferroelectric properties. Despite having a strong impact on transport and magnetic properties, Mg doping affects only slightly the crystal and magnetic structures, as shown in CuCr0.98Mg0.02O2.
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