Mgb_2 Superconducting Whiskers Synthesized By Using The Hybrid Physical-chemical Vapor Deposition

摘要

Since the discovery of superconductivity in MgB_2 in 2001, tremendous research activities have been stimulated. Both understanding the basic properties and searching for mass production toward large scale applications are highly important for the study of MgB_2. MgB_2 has a remarkably high T_c(0) of ～39 K, a relatively high coherence length of ～5 nm compared with the high critical current density up to 1 × 10~8 A/cm~2 at 2 K and self-field, and a larger energy gap without a weak link between grain boundaries. All these advantages make it a promising candidate for applications in superconducting devices operating in the temperature range 4-20 K. In the past few years, research and development of MgB_2 have been rapidly progressing.