Significant enhancement of irreversibility field in clean-limit bulk MgB2

Details Significant enhancement of irreversibility field in clean-limit bulk MgB2 Significant enhancement of irreversibility field in clean-limit bulk MgB2

2002-08-03

arxiv.org/abs/cond-mat/0208054v2

Physics

Condensed Matter

Superconductivity

3 pages, 4 figures, submitted to Applied Physics Letters

Scientific paper

10.1063/1.1528289

Low resistivity ("clean") MgB2 bulk samples annealed in Mg vapor show an increase in upper critical field Hc2(T) and irreversibility field Hirr(T) by a factor of 2 in both transport and magnetic measurements. The best sample displayed Hirr above 14 T at 4.2 K and 6 T at 20 K. These changes were accompanied by an increase of the 40 K resistivity from 1.0 to 18 microohm-cm and a lowering of the resistivity ratio from 15 to 3, while the critical temperature Tc decreased by only 1-2 K. These results point the way to make prepare MgB2 attractive for magnet applications.

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