Magnesium Diboride Superconducting Films Synthesized by Different Electron-Beam Annealing Currents

Abstract:

Considerable progress to synthesize magnesium diboride (MgB₂) films by electron-beam annealing has been made. A series of MgB₂ films with a T_c higher than 35 K had been fabricated. MgB₂ film superconductivity is affected by electron-beam accelerating voltage, beam current, annealing duration, beam spot size and Mg/B ratio. In order to fabricate better MgB₂ films, these influence factors must be intensively studied. In this paper, the influence of e-beam current on superconductivity was investigated with an accelerating voltage of 32 kV, an annealing time of 0.26 s and different annealing beam currents of 9.9 mA, 10.7 mA, 12.8 mA, 13.3 mA and 14.0 mA. The results show the MgB₂ film with 12.8 mA has the highest T_c and the densest structure. Its zero-field J_c at 15K has reached 3.2×10⁶ A/cm². The variation of the film superconducting properties with the beam currents was grasped, which will lay the foundation for the fabrication of high quality MgB₂ thin films

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 737-742
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.737
• Online since: February 2014
• Authors: Zhuang Xu, Xiang Dong Kong*, Jun Wang, Han Li, Qian Dai, Qing Rong Feng
• Keywords: Beam Current, Electron-Beam Annealing, MgB₂, Superconducting Thin Film

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