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![[Figure 2]](aou5003fig2mag.jpg)
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Figure 2
(a) Constant-E scans at (1, qk, 0) and (b) constant-Q scans performed with two different fixed kf. For both panels (a) and (b), the fitted mode positions are shown with the colored lines and filled-in areas as described in the text. The predicted mode positions from linear-spin-wave calculations are plotted as vertical black bars and colored using the our fitted model parameters. (c) The 100 magnetic Bragg peak intensity as a function of temperature at 4.2 GPa. The dashed lines are guides to the eye. (d) Neutron intensity as a function of energy transfer at Q = (1, 1, 0) and (1, 0, 0) measured at 4.6 K and approximately 110 K with kf = 1.97 Å−1. The inset shows the effect on the fit quality when including an additional Gaussian peak with the same width and area as the mode observed at (1, 0, 0). The goodness of fit remains unchanged until about 0.5 meV, indicating that if a spin gap exists it must be smaller than 0.5 meV. (e) Constant-Q scans at 3.6 GPa. Expected AFM spin-wave mode positions (from the 4.2 GPa exchange parameters) are indicated by colored vertical bars for each Q. For Q = (0, 2, 0), the expected mode is at 6.1 meV. Gray points: reference scan at Q = (0.7, 1.3, 0). |
![[Figure 2]](aou5003fig2.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
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