Low-energy “clustered” magnetic excitations in Cu3Nb2O8?
We have characterised the magnetic fluctuations in Cu3Nb2O8 using powders and single crystals. We have observed two disparate modes with one ~6-8 meV and the second ~27 meV. It is difficult to understand these two bands consistently within a model of Cu2+ spins, however they can be understood in terms of clusters of S=1/2 spins. In collaboration with our theoretical collaborators at University College London we have developed a model for this. However, to complete this we need a measurement of the low-energy spin fluctuations to establish anisotropy parameters in the spin wave Hamiltonian. Because of the low symmetry of the crystal structure, a spectrometer with position sensitive detectors is required for measurements along all three reciprocal lattice directions. This proposal requests 5 days on IN5 to complete this study and to investigate possible future work involving a magnetic field.
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STOCK Christopher; CHEONG S-W.; EWINGS Russell; LANE Harry and OLLIVIER Jacques. (2019). Low-energy “clustered” magnetic excitations in Cu3Nb2O8?. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1617
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