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The Relevance Of The Self-Field For The 'Peak Effect' In The Transport Jc(H) Of Iron-Sheathed Mgb2 Wires, J. Horvat, Saeid Soltanian, W. K. Yeoh

Josip Horvat

Ferromagnetic sheath around a superconducting wire results in an unusual transport Jc(H). For the field perpendicular to the current, there is a plateau in Jc(H) at high temperatures and intermediate fields. This plateau develops into a peak at lower temperatures, resembling a “peak effect”. A model based on cancellation of the self-field of the current and external field within the iron sheath was proposed for the explanation of the plateau in Jc(H). We test this model in three key experiments. Firstly, we show that the form of Jc(H) for round MgB2/Fe wires is strongly temperature dependent. This is in contradiction …