Fig. 4: Optical signature of different magnetic phases in La3Ni2O7 at ambient pressure.
From: Optical properties and electronic correlations in La3Ni2O7 bilayer nickelates under high pressure
Compared are σxx,yy(ω) and σzz(ω) for (a) the nonmagnetic phase, (b) ferromagnetic order, (c) (π, 0) antiferromagnetic (AFM) stripe order, (d) AFM-A order, (e) AFM-A order with in-plane site disproportionation, and (f) (π/2, π/2) AFM charge-spin bi-stripe order as recently suggested SDW model. The structural models show the spin densities (yellow: positive; blue: negative). The interlayer coupling is AFM for (c–f), and only a single layer is shown in top view for (c, e, and, f). The experimental in-plane spectrum obtained at T ~ 150 K is displayed as black solid line30.
