A Three Dimensional Kasteleyn Transition: Spin Ice in a [100] Field
(2008)
A Three Dimensional Kasteleyn Transition: Spin Ice in a [100] Field
ArXiv 0710.0976 (2007)
Abstract:
We examine the statistical mechanics of spin-ice materials with a [100] magnetic field. We show that the approach to saturated magnetisation is, in the low-temperature limit, an example of a 3D Kasteleyn transition, which is topological in the sense that magnetisation is changed only by excitations that span the entire system. We study the transition analytically and using a Monte Carlo cluster algorithm, and compare our results with recent data from experiments on Dy2Ti2O7.Critical phenomena in a highly constrained classical spin system: Neel ordering from the Coulomb phase
ArXiv 0708.3791 (2007)
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. We investigate Neel ordering from such a Coulomb phase, induced by weak additional interactions that lift the degeneracy. We show that the critical point belongs to a universality class that is different from the one for the equivalent transition out of the paramagnetic phase, and that it is characterised by effective long-range interactions; alternatively, ordering may be discontinuous. We suggest that a transition of this type may be realised by applying uniaxial stress to a pyrochlore antiferromagnet.Critical phenomena in a highly constrained classical spin system: Neel ordering from the Coulomb phase
(2007)
Density of quasiparticle states for a two-dimensional disordered system: Metallic, insulating, and critical behavior in the class D thermal quantum Hall effect
(2007)