Figure 2
From: Anomalous magneto-elastic and charge doping effects in thallium-doped BaFe2As2

For Ba1-xTlxFe2As2 crystals with x = 0, 0.05, and 0.09, temperature dependence of (a) magnetic susceptibility along different crystallographic axes, (b) Hall effect and electrical resistivity, and (c) specific heat. The plot of C/T versus T2 is shown below 10 K in (c) bottom.