Pinch Points and Kasteleyn Transitions: How Spin Ice Changes its Entropy

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dc.creatorFennell, T.
dc.creatorBramwell, S. T.
dc.creatorMcMorrow, D. F.
dc.creatorManuel, P.
dc.date2007-08-23
dc.date.accessioned2026-07-07T08:25:15Z
dc.date.available2026-07-07T08:25:15Z
dc.descriptionComplex disordered states - from liquids and glasses to exotic quantum matter - are ubiquitous in nature. Their key properties include finite entropy, power-law correlations and emergent organising principles. In spin ice, spin correlations are determined by an ice rules organising principle that stabilises a magnetic state with the same zero point entropy as water ice. The entropy can be manipulated with great precision by a magnetic field: with field parallel to the trigonal axis one obtains quasi two dimensional kagome ice which can be mapped onto a dimer model. Here we use a field tilted slightly away from the trigonal axis to control the dimer statistical weights and realise the unusual critical behaviour predicted by Kasteleyn. Neutron scattering on Ho2Ti2O7 reveals pinch point scattering that characterises the emergent gauge structure of kagome ice; diffuse peaks that shift with field, signaling the Kasteleyn physics; and an unusual critical point.
dc.description17 pages, 5 figures. Significantly improved version appears in Nature Physics
dc.identifierhttps://arxiv.org/abs/0708.3186
dc.identifierhttp://arxiv.org/abs/0708.3186
dc.identifierNature Physics 3 (no. 8) 566-573 (2007)
dc.identifierdoi:10.1038/nphys632
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/136594
dc.subjectOther Condensed Matter
dc.titlePinch Points and Kasteleyn Transitions: How Spin Ice Changes its Entropy
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