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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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Official URL: http://dx.doi.org/10.1088/1361-648X/aa5d2e

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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 > 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:
DateEvent
1 March 2017Published
31 January 2017Accepted
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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