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

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

2006-08-14

arxiv.org/abs/cond-mat/0608308v1

Supercond. Sci. Technol. 20 (2007) L5-L8

Physics

Condensed Matter

Superconductivity

13 pages, 4 figures

Scientific paper

10.1088/0953-2048/20/3/L01

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.

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