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Figure 6
(a) Powder neutron diffraction patterns of the Au65Ga20Tb15 iQC measured at the base temperature (3.5 K) and at a paramagnetic temperature (20 K), i.e. below and above TC = 16 K inferred from bulk measurements. Calculated nuclear peak positions and their 6D indices are also shown. The calculations were performed using a 6D lattice parameter of a6D = 5.2966 Å. Vertical arrows indicate nuclear Bragg reflections originating from a minor impurity phase corresponding to the Au–Ga–Tb 1/1 PA. The magnetic [111000] peak is clearly observed at 2θ = 31.8° below TC and disappears above TC, providing direct evidence for the formation of long-range magnetic order in the Au65Ga20Tb15 iQC. (b) The temperature dependence of the integrated intensity of the [111000] reflection. A fit to the empirical relation I ∝ (1 − T/TC)2β yields an estimated transition temperature of TC = 16.1 (3) K.

IUCrJ
Volume 13| Part 5| September 2026| Pages 552-579
ISSN: 2052-2525
https://doi.org/10.1107/S2052252526006263