Superconducting properties of nanocrystalline MgB2

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

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number005
Pages (from-to)912-915
Number of pages4
JournalSuperconductor Science and Technology
Volume19
Issue number9
DOIs
Publication statusPublished - 2006 Sep 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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