Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-08-23
Nature Physics 3 (no. 8) 566-573 (2007)
Physics
Condensed Matter
Other Condensed Matter
17 pages, 5 figures. Significantly improved version appears in Nature Physics
Scientific paper
10.1038/nphys632
Complex 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.
Bramwell Steven. T.
Fennell Tom
Manuel Pascal
McMorrow D. F.
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