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The temperature evolution of the magnetic correlations in pure and diluted spin ice Ho2−xYxTi2O7
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Chang, Lieh-Jeng, Su, Yixi, Kao, Ying-Jer, Chou, Y. Z. (Yang-Zhi), Kakurai, K., Mittal, R., Schneider, H. (Harald), Brückel, Thomas, Balakrishnan, G. and Lees, Martin R. (2011) The temperature evolution of the magnetic correlations in pure and diluted spin ice Ho2−xYxTi2O7. Physica B: Condensed Matter, Vol.406 (No.12). pp. 2393-2396. doi:10.1016/j.physb.2010.10.077 ISSN 09214526.
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Official URL: http://dx.doi.org/10.1016/j.physb.2010.10.077
Abstract
Diffuse polarized neutron scattering studies have been carried out on single crystals of pyrochlore spin ice Ho(2-x)Y(x)Ti(2)O(7)(x = 0, 0.3, and 1) to investigate the effects of doping and anisotropy on spin correlations in the system. The crystals were aligned with the (1 - 10) orientation coincident with the direction of neutron polarization. For all the samples studied the spin flip (SF) diffuse scattering (i.e. the in-plane component) reveals that the spin correlations can be described using a nearest-neighbour spin ice model (NNSM) at higher temperatures (T = 3.6 K) and a dipolar spin ice model (DSM) as the temperature is reduced (T = 30 mK). In the non-spin flip (NSF) channel (i.e. the out-of-plane component), the signature of strong antiferromagnetic correlations is observed for all the samples at the same temperature as the dipolar spin ice behaviour appears in the SF channel. Our studies show that the non-magnetic dopant Y does not significantly alter SF or NSF scattering for the spin ice state, even when Y doping is as high as 50%. In this paper, we focus on the experimental results of the highly doped spin ice HoYTi(2)O(7) and compare our results with pure spin ice Ho(2)Ti(2)O(7). The crossover from a dipolar to a nearest-neighbour spin ice behaviour and the doping insensitivity in spin ices are briefly discussed.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Neutrons -- Diffraction, Spin waves, Ferromagnetism | ||||
| Journal or Publication Title: | Physica B: Condensed Matter | ||||
| Publisher: | Elsevier BV | ||||
| ISSN: | 09214526 | ||||
| Official Date: | June 2011 | ||||
| Dates: |
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| Volume: | Vol.406 | ||||
| Number: | No.12 | ||||
| Page Range: | pp. 2393-2396 | ||||
| DOI: | 10.1016/j.physb.2010.10.077 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Guo jia ke xue wei yuan hui [National Science Council (Taiwan)], National Center for Theoretical Sciences (Taipei) (NCTS) | ||||
| Grant number: | NSC 96-2739-M-213-001 (NSC), NSC99-2112-M-007-020 (NSC), NSC 97-2628-M-002-011-MY3 (NSC), NTU98R0066-65,-68 (NCTS) |
Data sourced from Thomson Reuters' Web of Knowledge
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