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

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(a) H_c2(0) in BaFe₂(As_1−xP_x)₂ estimated from the slope of H_c2(T) close to T_c using (squares) 13, and also estimates of H_c2(0) from the irreversibility field at low temperature (T=1.5 K) measured by torque magnetometry (circles). Error bars on H_c2 (circles) represent the uncertainties in locating H_irr and (squares) in extrapolating the values close to T_c to T=0. Error bars on x represent s.d. (b) The same data plotted as (H_c2(0))^0.5/T_c, which, in conventional theory, are proportional to the mass enhancement m*. The mass renormalization m*/m_b derived from specific heat measurements is shown for comparison (triangles) 10. The dashed line is a guide to the eye and solid lines in both parts are linear fits to the data.

Inline graphic — (a) H_c2(0) in BaFe₂(As_1−xP_x)₂ estimated from the slope of H_c2(T) close to T_c using (squares) 13, and also estimates of H_c2(0) from the irreversibility field at low temperature (T=1.5 K) measured by torque magnetometry (circles). Error bars on H_c2 (circles) represent the uncertainties in locating H_irr and (squares) in extrapolating the values close to T_c to T=0. Error bars on x represent s.d. (b) The same data plotted as (H_c2(0))^0.5/T_c, which, in conventional theory, are proportional to the mass enhancement m*. The mass renormalization m*/m_b derived from specific heat measurements is shown for comparison (triangles) 10. The dashed line is a guide to the eye and solid lines in both parts are linear fits to the data.