Overcritical state in superconducting round wires sheathed by iron

Abstract

Magnetic measurements carried out on MgB_2 superconducting round wires have shown that the critical current density J_c(B_a) in wires sheathed by iron can be significantly higher than that in the same bare (unsheathed) wires over a wide applied magnetic field B_a range. The magnetic behavior is, however, strongly dependent on the magnetic history of the sheathed wires, as well as on the wire orientation with respect to the direction of the applied field. The behavior observed can be explained by magnetic interaction between the soft magnetic sheath and superconducting core, which can result in a redistribution of supercurrents in the flux filled superconductor. A phenomenological model explaining the observed behavior is proposed.

9 pages, 7 figures

References in corpus (2)

• Properties of superconducting MgB_2 wires: "in-situ" versus "ex-situ" reaction technique
• Direct visualization of iron sheath shielding effect in MgB_2 superconducting wires

Cited by in corpus (7)

• Magnetic cloaking by a paramagnet/superconductor cylindrical tube in the critical state
• Interaction between superconductor and ferromagnetic domains in iron sheath: peak effect in MgB2/Fe wires
• Critical State Theory For The Magnetic Coupling Between Soft Ferromagnetic Materials And Type-II Superconductors
• Penetration of an external magnetic field into a multistrip superconductor/soft-magnet heterostructure
• The Bean model of the critical state in a magnetically shielded superconductor filament
• Magnetic-dipole induced appearance of vortices in a bilayered superconductor/soft-magnet heterostructure
• Magneto-optical investigations of Ag-sheathed Bi-2223 tapes with ferromagnetic shielding