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Spin correlations in the dipolar pyrochlore antiferromagnet Gd2Sn2O7
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Paddison, Joseph A M., Ehlers, Georg., Petrenko, Oleg, Wildes, Andrew R., Gardner, Jason S. and Ross Stewart, J. (2017) Spin correlations in the dipolar pyrochlore antiferromagnet Gd2Sn2O7. Journal of Physics: Condensed Matter, 29 (14). 144001. doi:10.1088/1361-648X/aa5d2e
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WRAP-spin-correlations-dipolar-pyrochlore-antiferromagnet-Gd2Sn2O7-Petrenko-2017.pdf - Accepted Version - Requires a PDF viewer. Download (3623Kb) | Preview |
Official URL: http://dx.doi.org/10.1088/1361-648X/aa5d2e
Abstract
We investigate spin correlations in the dipolar Heisenberg antiferromagnet Gd2Sn2O7 using polarised neutron-scattering measurements in the correlated paramagnetic regime. Using Monte Carlo methods, we show that our data are sensitive to weak further-neighbour exchange interactions of magnitude ∼0.5% of the nearest-neighbour interaction, and are compatible with either antiferromagnetic next-nearest-neighbour interactions, or ferromagnetic third neighbour interactions that connect spins across hexagonal loops. Calculations of the magnetic scattering intensity reveal rods of diffuse scattering along [111] reciprocal-space directions, which we explain in terms of strong antiferromagnetic correlations parallel to the set of <110> directions that connect a given spin with its nearest neighbours. Finally, we demonstrate that the spin correlations in Gd2Sn2O7 are highly anisotropic, and correlations parallel to third-neighbour separations are particularly sensitive to critical fluctuations associated with incipient long-range order.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Antiferromagnetism, Monte Carlo method | ||||||
| Journal or Publication Title: | Journal of Physics: Condensed Matter | ||||||
| Publisher: | IOP Publishing Ltd | ||||||
| ISSN: | 0953-8984 | ||||||
| Official Date: | 1 March 2017 | ||||||
| Dates: |
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| Volume: | 29 | ||||||
| Number: | 14 | ||||||
| Article Number: | 144001 | ||||||
| DOI: | 10.1088/1361-648X/aa5d2e | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Copyright Holders: | IOP Publishing Ltd | ||||||
| Funder: | Georgia institute of technology, Churchill college , United States. Department of Energy. Office of Basic Energy Sciences (OBES) |
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