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Spin ice under pressure: symmetry enhancement and infinite order multicriticality
L D C Jaubert1, J T Chalker, P C W Holdsworth
1Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany.
Abstract:
We study the low-temperature behavior of spin ice when uniaxial pressure induces a tetragonal distortion. There is a phase transition between a Coulomb liquid and a fully magnetized 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 realization.
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