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Doping effect of nano-diamond on superconductivity and flux pinning in MgB 2

2003; IOP Publishing; Volume: 16; Issue: 10 Linguagem: Inglês

10.1088/0953-2048/16/10/310

1361-6668

C.H. Cheng, Heyun Zhang, Yong Zhao, Yan Feng, Rui Xiong, Paul Munroe, H. Zeng, N. Koshizuka, M. Murakami,

Iron-based superconductors research

Doping effect of diamond nanoparticles on the superconducting properties of MgB 2 bulk material has been studied.It is found that the superconducting transition temperature T c of MgB 2 is suppressed by the diamond-doping, however, the irreversibility field H irr and the critical current density J c are systematically enhanced.Microstructural analysis shows that the diamond-doped MgB 2 superconductor consists of tightly-packed MgB 2 nano-grains (~50-100 nm) with highly-dispersed and uniformly-distributed diamond nanoparticles (~10-20 nm) inside the grains.High density of dislocations and diamond nanoparticles may take the responsibility for the enhanced flux pinning in the diamond-doped MgB 2 .