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Spin ice under pressure: symmetry enhancement and infinite order multicriticality
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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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Hearing the light: stray-field noise from the emergent photon in quantum spin ice
Finite-size emergent-photon modes produce measurable, boundary-condition-dependent stray-field noise: superconducting boundaries give sharp NV-detected spectra, insulating boundaries give none.
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