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Model of the low temperature magnetic phases of gadolinium gallium garnet
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Ancliff, Mark, Sachnev, Vasily and d'Ambrumenil, Nicholas (2021) Model of the low temperature magnetic phases of gadolinium gallium garnet. Journal of Physics. Condensed matter : an Institute of Physics journal, 33 (47). 475801. doi:10.1088/1361-648X/ac1f4f ISSN 1361-648X.
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Official URL: https://doi.org/10.1088/1361-648X/ac1f4f
Abstract
The magnetic behaviour of gadolinium gallium garnet in an external magnetic field at zero temperature is considered. For high fields a classical spin model of the gadolinium ions predicts a spin configuration that is periodic at the level of the smallest repeating unit cell. The quantum version of the model is treated via a truncated Holstein-Primakoff transformation with axes defined by the classical spin configuration, and the magnon excitation bands are calculated. The model predicts a transition in the field range of 1.9-2.1 T, sensitive to the direction of the applied field, which is caused by one or more magnon modes becoming soft as the field is decreased. In general the soft modes occur at incommensurate wavevectors and therefore break the periodicity of the spin configuration below the transition. One exception occurs when the field aligns with one of the principle crystal axes, in which case periodicity of the spin configuration is found to be maintained on a larger crystallographic cubic cell even below the transition. This simple case is studied in more detail. Comparisons are drawn with existing experimental data, and further experimental tests of the model are suggested. [Abstract copyright: © 2021 IOP Publishing Ltd.]
| Item Type: | Journal Article | ||||||
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Journal or Publication Title: | Journal of Physics. Condensed matter : an Institute of Physics journal | ||||||
| Publisher: | IOP Publishing Ltd | ||||||
| ISSN: | 1361-648X | ||||||
| Official Date: | 8 September 2021 | ||||||
| Dates: |
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| Volume: | 33 | ||||||
| Number: | 47 | ||||||
| Article Number: | 475801 | ||||||
| DOI: | 10.1088/1361-648X/ac1f4f | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Reuse Statement (publisher, data, author rights): | "This is an author-created, un-copyedited version of an article accepted for publication/published in Journal of Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-648X/ac1f4f | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Date of first compliant deposit: | 5 January 2022 | ||||||
| Date of first compliant Open Access: | 8 September 2022 |
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