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Prof. John Chalker, University of Oxford
Thursday 11 October 2007, 14:15-15:45
Phase transitions in highly constrained spin systems: Ordering from the Coulomb phase.
- 👤 Speaker: Prof. John Chalker, University of Oxford
- 📅 Date & Time: Thursday 11 October 2007, 14:15 - 15:45
- 📍 Venue: TCM Seminar Room, Cavendish Laboratory
Abstract
Many classical, geometrically frustrated antiferromagnets have macroscopically degenerate ground states. In a class of three-dimensional systems, the set of degenerate ground states has power-law correlations and is an example of a Coulomb phase, with long-wavelength fluctuations described by a Gaussian solenoidal field. A perturbation applied to the system can lift the degeneracy and induce a phase transition. Because of the power-law correlations (or, equivalently, the solenoidal nature of the degrees of freedom), phase transitions of this kind are unusual.
In this seminar, I aim to give a straightforward introduction to the area and to discuss these phase transitions from several points of view.
Series This talk is part of the TCM Blackboard Series series.
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