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Ice rule correlations in stuffed spin ice

Author(s): Aldus, Robert J.; Fennell, Tom; Deen, Pascale P.; Ressouche, Eric; Lau, Garret C.; et al

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Abstract: Stuffed spin ice is a chemical variation of a spin ice material like Ho2Ti2O7 in which extra magnetic ions are inserted into the crystal structure. Previous studies have shown that the degree of stuffing has very little effect on the residual entropy in the system, which takes a value very close to the spin ice entropy. We argue, however, that the observation of this entropy does not imply long range coherence of the ice rules, that determine the local spin configurations. We have characterized deviations from the ice rules by means of a polarized neutron diffraction study of a single crystal of Ho2+δTi2-δO 7-δ/2 with δ = 0.3. Our results demonstrate that the ice rules in stuffed spin ice are strictly valid only over a relatively short range, and that at longer range stuffed spin ice exhibits some characteristics of a 'cluster glass', with a tendency to more conventional ferromagnetic correlations. © IOP Publishing and Deutsche Physikalische Gesellschaft.
Publication Date: 1-Jan-2013
Electronic Publication Date: 14-Jan-2013
Citation: Aldus, R.J., Fennell, T., Deen, P.P., Ressouche, E., Lau, G.C., Cava, R.J., Bramwell, S.T. (2013). Ice rule correlations in stuffed spin ice. New Journal of Physics, 15 (1), 013022 - 013022. doi:10.1088/1367-2630/15/1/013022
DOI: doi:10.1088/1367-2630/15/1/013022
EISSN: 1367-2630
Pages: 15:013022-1 - 013022-10
Type of Material: Journal Article
Journal/Proceeding Title: New Journal of Physics
Version: Final published version. This is an open access article.
Notes: New Journal of Physics. Volume 15, January 2013, Article number 013022.

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