Magnetoelastic coupling in the frustrated antiferromagnetic triangular lattice CuMnO 2

摘要: The magnetic ordering transition coupled to a structural in the anisotropic triangular lattice ${\text{CuMnO}}_{2}$ is investigated by high-resolution neutron powder diffraction. Temperature dependence of order parameter and relevant quantities, such as cell constants atomic positions, analysis Landau potential show that there unique critical temperature, well primary magnetic. phase transition, necessary lift degeneracy, improper ferroelastic with linear-quadratic coupling between strain magnetization density.