| Phase transitions, partial disorder and multi-k structures in Gd2Ti2O7 (2004) | |||||||
Abstract | |||||||
| 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 T^{\prime }=0.7 K. Here we use neutron diffraction to definitively establish the nature of the phase transition at T^{\prime } and the magnetic structure adopted below this temperature. Between T^{\prime } and TN the structure is partly ordered, as previously reported. Below T^{\prime } 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. | |||||||
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