Spin dynamics in geometrically frustrated Heisenberg antiferromagnets

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• John Chalker, U of Oxford
• Thursday 04 March 2010, 13:45-15:00
• Theory Library.

If you have a question about this talk, please contact Dr Dimitri M Gangardt.

I will talk about the statistical mechanics and especially the dynamics of classical models of geometrically frustrated antiferromagnets at low temperature. These are systems which have both strong correlations and large fluctuations, and classical models seem to give a surprisingly good description of behaviour in many materials. A central feature of the physics is that the degrees of freedom that are free to fluctuate at low temperature can be thought of as flux lines in an emergent solenoidal field. For this reason, the low temperature state has been called a Coulomb phase. Its statics have been well-characterised over the last few years, both theoretically and in diffuse elastic neutron scattering experiments. After reviewing this background, I will describe recent work on dynamics in the Coulomb phase.

Reference:

P. H. Conlon and J. T. Chalker Phys. Rev. Lett. 102, 237206 (2009)

This talk is part of the Theoretical Physics Seminars series.

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