Grain boundaries as weak links: The case of MgB2 with reference to YNi2B2C

S. B. Samanta, H. Narayan, A. Gupta, A. V. Narlikar, T. Muranaka, J. Akimitsu

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


The grain boundaries (GB's) in the intermetallic superconductor MgB2, interestingly, do not show suppression of supercurrent density. This unexpected behavior has been investigated by a scanning tunneling microscopy/spectroscopy technique at atomic resolution. The GB in MgB2 is seen as an amorphous region extending from ∼50 to 200 Å and has a metallic character. This observation supports proximity coupling between the grains, which explains why supercurrent density does not degrade in this material. The results for another intermetallic superconductor YNi2B2C having GB's (average width ∼30 Å) that are quasi-insulating in nature have also been presented and compared with the former.

Original languageEnglish
Article number092510
Pages (from-to)925101-925103
Number of pages3
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
Publication statusPublished - Mar 1 2002
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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