Spin ice under pressure: symmetry enhancement and infinite order multicriticality

Details Spin ice under pressure: symmetry enhancement and infinite order multicriticality Spin ice under pressure: symmetry enhancement and infinite order multicriticality

2010-03-25

arxiv.org/abs/1003.4896v1

Physical Review Letters 105, 105 (2010) 087201

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevLett.105.087201

We study the low-temperature behaviour of spin ice when uniaxial pressure induces a tetragonal distortion. There is a phase transition between a Coulomb liquid and a fully magnetised phase. Unusually, it combines features of discontinuous and continuous transitions: the order parameter exhibits a jump, but this is accompanied by a divergent susceptibility and vanishing domain wall tension. All these aspects can be understood as a consequence of an emergent SU(2) symmetry at the critical point. We map out a possible experimental realisation.

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