Grain boundaries as weak links: The case of (formula presented) with reference to (formula presented)

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

Research output: Contribution to journalArticlepeer-review


The grain boundaries (GB’s) in the intermetallic superconductor (formula presented) 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 (formula presented) 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 (formula presented) having GB’s (average width 30 Å) that are quasi-insulating in nature have also been presented and compared with the former.

Original languageEnglish
Pages (from-to)1-3
Number of pages3
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
Publication statusPublished - Jan 1 2002
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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