J R Stewart et al 2004 J. Phys.: Condens. Matter 16 L321 doi:10.1088/0953-8984/16/28/L01
Phase transitions, partial disorder and multi-k structures in Gd2Ti2O7
FREE ARTICLEJ R Stewart1, G Ehlers2, A S Wills3, S T Bramwell3 and J S Gardner4,5
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The geometrically frustrated antiferromagnet Gd2Ti2O7 exhibits magnetic behaviour of such complexity that it poses a challenge to both experiment and theory. Magnetic ordering commences at TN = 1.1 K and there is a further magnetic phase transition at 
K. Here we use neutron diffraction to definitively establish the nature of the phase transition at 
and the magnetic structure adopted below this temperature. Between 
and TN the structure is partly ordered, as previously reported. Below 
the remaining spins order, but only weakly. The magnetic structure in this temperature range is shown to be a 4-k structure, closely related to the 1-k structure previously suggested. The 4-k and 1-k variants of the structure are distinguished by analysis of the diffuse scattering, which we believe represents a new method of solving the 'multi-k' problem of magnetic structure determination.
- PACS
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61.05.fg Neutron scattering (including small-angle scattering)
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
- Subjects
- Dates
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Issue 28 (21 July 2004)
Received 12 March 2004
Published 2 July 2004
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Phase transitions, partial disorder and multi-k structures in Gd2Ti2O7
J R Stewart et al 2004 J. Phys.: Condens. Matter 16 L321
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