Fig. 4. Observable changes in the intensities and angular dependence of the Raman modes with applied magnetic field.

a Changes in the polar intensity of ${\mathrm{A}}_{\mathrm{g}}^6$ (maximum intensity normalized to one), as a function of θ for (a) B = 0 T (black), 1 T (blue), and 2 T (magenta) for B ⊥ ab plane. b Comparing the polar intensity of ${\mathrm{A}}_{\mathrm{g}}^6$ at positive (magenta) and negative (green) applied magnetic fields. c Angle of maximum intensity in polar plot in a as a function of magnetic field, where field ranges from Fig. 3b are marked. d Intensity of P₂ relative to the intensity of the combined mode ${\mathrm{A}}_{\mathrm{g}}^5{\mathrm{/B}}_{\mathrm{g}}^3$, labeled $I\left({\mathrm{P}}_2\right)\mathrm{/}I\left({\mathrm{A}}_{\mathrm{g}}^5{\mathrm{/B}}_{\mathrm{g}}^3\right)$, as a function of applied magnetic field (B ⊥ ab plane) at various sample temperatures. e $I\left({\mathrm{P}}_2\right)\mathrm{/}I\left({\mathrm{A}}_{\mathrm{g}}^5{\mathrm{/B}}_{\mathrm{g}}^3\right)$ as a function of applied magnetic field (B ∥ ab plane). Insets of e show the magnetic stacking orders in the AFM and FM states for B ∥ ab plane. f Polar intensity of ${\mathrm{A}}_{\mathrm{g}}^6$ for a magnetic field (7 T) applied parallel to the ab plane at two different crystal orientations (φ₁ and φ₁ + 90°). Sample temperature was 9 K (2 K) for B ⊥ ab (B ∥ ab). Error bars represent standard errors from fitting function.