Improved critical current densities in MgB2 tapes with ZrB2 doping

Details Improved critical current densities in MgB2 tapes with ZrB2 doping Improved critical current densities in MgB2 tapes with ZrB2 doping

2006-10-11

arxiv.org/abs/cond-mat/0610286v1

Appl. Phys. Lett. 89, 132510 (2006)

Physics

Condensed Matter

Superconductivity

14 pages, 6 figures

Scientific paper

10.1063/1.2357884

MgB2/Fe tapes with 2.5-15 at.% ZrB2 additions were prepared through the in situ powder-in-tube method. Compared to the pure tape, a significant improvement in the in-field critical current density Jc was observed, most notably for 10 at.% doping, while the critical temperature decreased slightly. At 4.2 K, the transport Jc for the 10 at.% doped sample increased by more than an order of magnitude than the undoped one in magnetic fields above 9 T. Nanoscale segregates or defects caused by the ZrB2 additions which act as effective flux pinning centers are proposed to be the main reason for the improved Jc field performance.

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