Abstract
Nanocrystalline MgB2 produced by mechanical alloying has been shown to exhibit enhanced superconductingproperties such as increased pinning and higher critical currents. However, the effects of thesynthesis process on the intrinsic superconducting properties have not been addressedyet. We have investigated the superconducting gap structure of nanocrystallineMgB2 pelletssynthesized by high-energy ball milling employing specific heat measurements. We found that the largerσ-gap decreased whereasthe smaller π-gap slightlyincreased in ball-milled MgB2 as compared to bulk samples synthesized along the standard routes. Thedata show that the ball-milling process introduces defects that enhance theinterband scattering similar to irradiation with neutrons. The reduction of theσ-gap explains the lower superconducting transition temperature of 33 K.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
