Superconducting properties of nanocrystalline MgB2

B. Lorenz, O. Perner, J. Eckert, C. W. Chu

研究成果: Article同行評審

19 引文 斯高帕斯(Scopus)

摘要

Nanocrystalline MgB2 produced by mechanical alloying has been shown to exhibit enhanced superconducting properties such as increased pinning and higher critical currents. However, the effects of the synthesis process on the intrinsic superconducting properties have not been addressed yet. We have investigated the superconducting gap structure of nanocrystalline MgB 2 pellets synthesized by high-energy ball milling employing specific heat measurements. We found that the larger σ-gap decreased whereas the smaller π-gap slightly increased in ball-milled MgB2 as compared to bulk samples synthesized along the standard routes. The data show that the ball-milling process introduces defects that enhance the interband scattering similar to irradiation with neutrons. The reduction of the σ-gap explains the lower superconducting transition temperature of 33 K.

原文English
文章編號005
頁(從 - 到)912-915
頁數4
期刊Superconductor Science and Technology
19
發行號9
DOIs
出版狀態Published - 2006 九月 1

All Science Journal Classification (ASJC) codes

  • 陶瓷和複合材料
  • 凝聚態物理學
  • 金屬和合金
  • 電氣與電子工程
  • 材料化學

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