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Polycrystalline NdFeAsO0.88F0.12 superconductors prepared by high pressure(HP) and ambient pressure (AP) method were comparatively studied bymagnetization and transport measurements. Upper critical field (Hc2),irreversibility field (Hirr) and the anisotropy parameter were estimated fromresistance transition curves. The broadening of transition width was observed,and ascribed to both Hc2 anisotropy and superconductivity inhomogeneity ofsamples. Magnetic hysteresis loops (MHLs) in low fields were measured to detectthe trace of weak-link behavior. The reclosed hysteresis loops in low fieldsmanifest that there are weak-links in both samples. Magnetization criticalcurrent density Jcm were derived from MHLs. High-pressure synthesized sampleshows higher Jcm. However, by means of direct transport I-V measurements,transport critical current density Jct was very low. The Jct values for twosamples are comparable. Large discrepancies between Jcm and Jct also indicatethat there are weak-links in both samples. The relative mechanism is discussedin detail.

Comparative study of transport and magnetic Jc in the polycrystalline iron-based superconductor NdFeAsO{0.88}F{0.12}