Fig. 3: Magnetic field response and depth profile of magnetism in SRO₂₁₄.

a, b, Temperature dependence of the local field amplitude B_loc (a) and of the shift in the depolarization rate, Δλ, from the λ value measured at T = 200 K (b) measured in TF with amplitude of the external field B_ext = 1500 G at E = 3 keV (red symbols with error bars) and E = 14 keV (blue symbols with error bars). Error bars in (a) are within the symbols. The inset schematic in (a) shows the relative orientation of the applied field B_ext with respect to the muon spin polarization S_μ+ in our orthonormal reference-axes system for the TF configuration. The Δλ values in (b) are different from those shown in Fig. 2, as they are measured at a different stage of the experiment after warming the samples to room T, degaussing the magnet and zero-field cooling the samples again before applying B_ext. c, d Shift in the local field amplitude ΔB_loc (c) and in Δλ (d) between T = 100 K > T_on and T = 5 K < T_on measured in TF as a function of E for B_ext = 100 G (green symbols with error bars) and B_ext = 1500 G (purple symbols with error bars). The top axes are the corresponding muon average stopping depth \(\bar{z}\) values determined from the simulated muon stopping distributions in Fig. 1d. Dashed lines in (b) to (d) are guides to the eye.