Figure 3: For Ba1-xTlxFe2As2 crystals, neutron diffraction results for x = 0 (left), x = 0.05 (middle), and x = 0.09 (right).
From: Anomalous magneto-elastic and charge doping effects in thallium-doped BaFe2As2

The temperature dependence of Bragg reflections are shown upon warming. Top panels: integrated intensity of the nuclear peak (400)O/(220)T and the peak intensity of the magnetic peak (105)O/(½½5)T; curved line is a guide for eyes. The solid/dashed line marks the structural/magnetic transition. Bottom panels: full peak width of (400)O/(220)T at half peak maximum.