Comparison of physical properties for carbon nanotube doped MgB2 superconductors synthesized with different process
✍ Scribed by Guoqiu Yuan; Xiaonong Xu; Zhihe Wang; Dingwei Lu; Xin Jin
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 453 KB
- Volume
- 432
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
Carbon nanotubes (CNT) doping of magnesium diboride with a nominal stoichiometry of MgB 1.9 C 0.1 synthesized under ambient pressure (AP) and high pressure (HP) leads to an improvement in the critical current density J c and the upper critical field H c2 (T) with a slight depression in the superconducting transition temperature. The anomalous temperature dependence of H c2 (T) with a positive curvature implies the existence of two gaps in both samples. At elevated fields, the fact of the current density decays as J c (H) / H Àb in HP samples suggests a possible route to overcome J c (H) decreasing rapidly with increasing fields.