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. 2016 Aug 25;7:12592. doi: 10.1038/ncomms12592

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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The data shown are from HTO, but are representative of both materials. (a) A schematic view of the pyrochlore lattice: spins are represented as black arrows, and tetrahedra are coloured light blue. The coloured lines show, starting from the white circle, a first (light blue), second (red) and two types of third (green and light green) nearest neighbour. (b) Sign convention for the angle shown in a single tetrahedron: rotations towards [112] are negative while those towards [110] are positive. (c) Magnetic susceptibility: when the field is rotated towards [110] the peak remains unique. (d) As the field is rotated towards [112], the peak splits into two, the upper one moves faster with field as the angle is increased. The temperature for all curves is fixed at 0.18 K and in all cases a smoothly varying background has been subtracted for clarity.