Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-10-14
J. Phys.: Conf. Ser. {145} 012032 (2009)
Physics
Condensed Matter
Statistical Mechanics
8 pages. 7 figures. Version to be published for Proceedings of HFM2008 Conference. Slight modifications compared to Version #1
Scientific paper
10.1088/1742-6596/145/1/012032
We consider the possibility that the discrete long-range ordered states of Er2Ti2O7 are selected energetically at the mean field level as an alternative scenario that suggests selection via thermal fluctuations. We show that nearest neighbour exchange interactions alone are not sufficient for this purpose, but that anisotropies arising from excited single ion crystal field states in Er2Ti2O7, together with appropriate anisotropic exchange interactions, can produce the required long range order. However, the effect of the single ion anisotropies is rather weak so we expect thermal or quantum fluctuations, in some guise, to be ultimately important in this material. We reproduce recent experimental results for the variation of magnetic Bragg peak intensities as a function of magnetic field.
Curnoe S. H.
Gingras Michel J. -P.
McClarty Paul A.
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