Figure 2: Temperature evolution of the two-magnon spectra.
From: Interplay of Dirac electrons and magnetism in CaMnBi2 and SrMnBi2
Measured Raman spectra of (a) CaMnBi2, (b) SrMnBi2 and (c) BaMn2Bi2. Highlighted are the spectra at 50 and 300 K in a, 260 and 300 K in b, and at 100 K in c, where resistivity and susceptibility anomalies or antiferromagnetic transitions were observed in measurements using other techniques as discussed in the text, but no anomalies are visible in the two-magnon spectra at these temperatures. The spectra were collected in an unpolarized configuration to obtain a better signal-to-noise ratio.
