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Figure 15
The result of calling the program Get_irreps within the conjugacy class numbered 5 in Fig. 14 for the subgroup I4/mcm (a − b, a + b, 2c; 0, 0, 0). One can see that the irrep [{\rm R}_{4}^{+}] with wavevector (½, ½, ½) (point R in the Brillouin zone) is responsible for this symmetry break.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 57| Part 5| October 2024| Pages 1650-1666
https://doi.org/10.1107/S1600576724008070
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