Large irreversibility field in nanoscale C-doped MgB2/Fe tape conductors

Abstract

We investigated the effect of nanoscale-C doping on the critical current density Jc and irreversibility field Birr of Fe-sheathed MgB2 tapes prepared by the in-situ powder-in-tube method. The tapes were heat treated at 600-950C for 1 h. Higher values of Jc and Birr were seen for 5 at.%C-doped MgB2 tapes at higher sintering temperatures, where substantial substitution of boron for carbon occurred. The C-doped samples sintered at 950C showed the highest Birr, for example, at 4.2 K, the Birr reached 22.9 T. In particular, at 20 K, Birr for the C-doped tape achieved 9 T, which is comparable to the upper critical field of the commercial NbTi at 4.2 K. This role of nano-sized C particles can be very beneficial in the fabrication of MgB2 tapes for magnetic resonance imaging applications at 20 K.

arXiv comment13 pages, 4 figures

References in corpus (11)

• Enhancement of the critical current density and flux pinning of MgB2 superconductor by nanoparticle SiC doping
• Systematic effects of carbon doping on the superconducting properties of Mg(B${}_{1-x}$C${}_x$)${}_2$
• Enhancement of the high-field critical current density of superconducting MgB2 by proton irradiation
• High-field superconductivity in alloyed MgB2 thin films
• High Critical Current Density and Improved Irreversibility Field in Bulk MgB2 Made By A Scaleable, Nanoparticle Addition Route
• Significantly enhanced critical current densities in MgB2 tapes made by a scaleable, nano-carbon addition route
• Improved Hc2 in Bulk-Form Magnesium Diboride by Mechanical Alloying With Carbon
• Hot isostatic pressing of powder in tube MgB2 wires
• Large Upper Critical Field and Irreversibility Field in MgB2 wires with SiC additions
• Improvement of critical current density in Fe-sheathed MgB2 tapes by ZrSi2, ZrB2 and WSi2 doping
• Enhanced critical current density of MgB2 superconductor synthesized in high magnetic fields

Cited by in corpus (6)

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• Large transport critical currents and magneto-optical imaging of textured Sr1-xKxFe2As2 superconducting tapes
• Development of Doped MgB2 Wires and Tapes for Practical Applications
• Hollow carbon spheres as an efficient dopant for enhancing critical current density of MgB2 based tapes