Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-07-24
Phys. Rev. Lett. 101, 037204 (2008)
Physics
Condensed Matter
Statistical Mechanics
4 pages, 2 figures. Conforms to published version. Small amendments compared to version #1. A high resolution version of Figur
Scientific paper
10.1103/PhysRevLett.101.037204
Dy2Ti2O7 is a geometrically frustrated magnetic material with a strongly correlated spin ice regime that extends from 1 K down to as low as 60 mK. The diffuse elastic neutron scattering intensities in the spin ice regime can be remarkably well described by a phenomenological model of weakly interacting hexagonal spin clusters, as invoked in other geometrically frustrated magnets. We present a highly refined microscopic theory of Dy2Ti2O7 that includes long-range dipolar and exchange interactions to third nearest neighbors and which demonstrates that the clusters are purely fictitious in this material. The seeming emergence of composite spin clusters and their associated scattering pattern is instead an indicator of fine-tuning of ancillary correlations within a strongly correlated state.
Bramwell Steven. T.
Fennell Tom
Gingras Michel J. -P.
Yavors'kii Taras
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