(a) Raman spectra measured at different temperatures for LaMn₃Cr₄O₁₂. No long-range structural phase transition is observed between 300 K and 10 K. Temperature dependence of (b) Raman shift and (c) the full width at half maximum (FWHM) for the two strongest Raman modes A_g(2) and E_g(2). Anomalies around 180 K may indicate local structural changes, as described in text.