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. 2014 Dec 5;5:5679. doi: 10.1038/ncomms6679

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(a) H_c2(T) data close to T_c(H=0) from heat capacity measurements for different samples of BaFe₂(As_1−xP_x)₂. (b) Magnetic torque versus rising and falling field for a sample with x=0.40 at T=1.5 K. The irreversibility field H_irr is marked. (c) Magnetic flux density B versus applied field H as measured by the micro-Hall sensors, for x=0.35 and T=18 K at two different sensor positions: one at the edge of the sample and the other close to the centre (schematic inset). (d) Remnant field B_r after subtraction of the linear term due to flux leakage around the sample. |B_r|^0.5 versus μ₀H is plotted as this best linearizes B_r(H)14. Note that the changes in linearity of B(H) evident in d are not visible by eye in c.