title: Spin ice under pressure: symmetry enhancement and infinite order multicriticality.
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.
authors.affiliation: Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany.
authors.forename: L D C
authors.initials: LD
authors.lastname: Jaubert
authors.forename: J T
authors.initials: JT
authors.lastname: Chalker
authors.forename: P C W
authors.initials: PC
authors.lastname: Holdsworth
authors.forename: R
authors.initials: R
authors.lastname: Moessner