Thesis entitled Magnetic properties of the M3V2O8 compounds (download 37Mb)
Supervisor: OA Petrenko
Neutron scattering techniques available at central facilities such as ISIS, the ILL and the LLB were used alongside in-house measurements to investigate highly degenerate magnetic systems. Single crystal samples were prepared from powder using IR image furnaces.
The Kagome lattice is a very important structure in the field of frustrated magnetism. The lattice has a two dimensional corner-sharing triangular structure, which creates macroscopic degeneracy when combined with antiferromagnetic interactions. Experimentally it is diffcult to find a perfect example of this lattice. Ni3V2O8 and Co3V2O8 are the first compounds found to adopt a buckled version of the Kagome lattice by their magnetic atoms, called the Kagome staircase. The staircase lattice differs from the two dimensional lattice in a number of ways: the magnetic layers have lower symmetry and the further neighbour interactions, with the resulting anisotropic exchange interactions, become more important. These factors cause the relief of geometrical frustration and establish long-range magnetic order.
Powders and large single crystals, both of very high quality, of these compounds have been prepared. Magnetisation and specific heat measurements have been used to produce the magnetic field vs temperature phase diagrams and neutron diffraction has been used to determine the different magnetic structures present in the materials.
Nic is currently Director of Stripey Llama Ltd.
SaaS Programme Manager
Eurotherm by Schneider Electric