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Substitution-induced pinning in MgB 2 superconductor doped with SiC nano-particles

2002; IOP Publishing; Volume: 15; Issue: 11 Linguagem: Inglês

10.1088/0953-2048/15/11/317

1361-6668

Shi Xue Dou, A. V. Pan, S.H. Zhou, Mihail Ionescu, Huan Liu, Paul Munroe,

Iron-based superconductors research

By doping MgB_2 superconductor with SiC nano-particles, we have successfully introduced pinning sites directly into the crystal lattice of MgB_2 grains (intra-grain pinning). It became possible due to the combination of counter-balanced Si and C co-substitution for B, leading to a large number of intra-granular dislocations and the dispersed nano-size impurities induced by the substitution. The magnetic field dependence of the critical current density was significantly improved in a wide temperature range, whereas the transition temperature in the sample MgB_2(SiC)_x having x = 0.34, the highest doping level prepared, dropped only by 2.6 K.