Figure 2
From: Oxypnictide SmFeAs(O,F) superconductor: a candidate for high–field magnet applications
In-field resistivity (ρ) measurements of SmFeAs(O,F) film up to 45 T and the analyses of the activation energy of pinning potential (U0).
(a) Arrhenius plots of ρ at various magnetic fields parallel to the crystallographic c-axis and (b) ab-plane. The inset shows the μ0H − Tc,90 diagram of SmFeAs(O,F) film for both directions, which is the identical to the extracted temperature dependence of the upper critical fields by employing a 90% criterion of the normal state resistivity. (c) Field dependence of the activation energy for H || c and || ab. (d) Relationship between lnρ0 and U0 for H || c and || ab.
