Spin ice under pressure: symmetry enhancement and infinite order multicriticality

Abstract : 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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Ludovic D.C. Jaubert, J.T. Chalker, Peter C.W. Holdsworth, R. Moessner. Spin ice under pressure: symmetry enhancement and infinite order multicriticality. Physical Review Letters, American Physical Society, 2010, 8 (105), pp.087201. ⟨10.1103/PhysRevLett.105.087201⟩. ⟨ensl-00462955⟩

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