Abstract
We have investigated the magnetoelastic effects inCoF2 associated with the antiferromagnetic phase transition temperatureTN≈39 K by means of neutron powder diffraction. The temperature variation of thelattice parameters and the unit cell volume has been determined accurately withsmall temperature steps. From the temperature variation of the lattice parameterc we extracted thelattice strain Δc associated with the antiferromagnetic phase transition. Rietveld refinementof the crystal and magnetic structure from the diffraction data at2.2 K gave a magneticmoment of 2.57 ± 0.02 μB per Co ion. We determined the temperature variation of the intensity of the100 magnetic Bragg reflection, which is proportional to the square of the orderparameter of the phase transition. We established that the lattice strainΔc couples linearly with the square of the order parameter of the antiferromagnetic phase transition inCoF2.
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