Probing the k-dispersion of the thermal fluctuation spectrum near theantiferromagnetic phase transitionof NiO
In the present experiment, we aim at measuring directly the thermal fluctuation spectrum of the order parameter in the vicinity of a second-order phase transition by using single-crystal neutron diffraction. As a model system, we propose to study the antiferromagnetic (AFM) transition of NiO, owing to the simplicity of its nuclear and magnetic structures. The above spectrum will be measured by measuring precisely the q-dependence of the diffuse scattering intensity across the AFM Bragg peak at (1/2 1/2 1/2) along the [100], [110] and [100] directions of the cubic symmetry and at different temperatures in the thermal fluctuation region. The knowledge of the spectrum shall enable us to unveil the exact functional form of the anisotropic exchange interaction and thus to verify the deviation of the effective Hamiltonian driving the transition from simplified model Hamiltonians like Ising, Heisenberg and 3DXY models.
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The recommended format for citing this dataset in a research publication is in the following format:
Andrea Gauzzi; AYAPE KATCHO Nebil; FARAGO Bela; KIBALIN Iurii; OULADDIAF Bachir; SABOUNGI Marie-Louise and VARLAMOV Andrey. (2023). Probing the k-dispersion of the thermal fluctuation spectrum near theantiferromagnetic phase transitionof NiO. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-53-313
This data is not yet public
This data is not yet public
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