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

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 journal › Article › peer-review

Abstract

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 YNi₂B2_C having GB's (average width ∼30 Å) that are quasi-insulating in nature have also been presented and compared with the former.

Original language	English
Article number	092510
Pages (from-to)	925101-925103
Number of pages	3
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	9
Publication status	Published - Mar 1 2002
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

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title = "Grain boundaries as weak links: The case of MgB2 with reference to YNi2B2C",

abstract = "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 {\AA} 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 {\AA}) that are quasi-insulating in nature have also been presented and compared with the former.",

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AU - Samanta, S. B.

AU - Narayan, H.

AU - Gupta, A.

AU - Narlikar, A. V.

AU - Muranaka, T.

AU - Akimitsu, J.

PY - 2002/3/1

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N2 - 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.

AB - 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.

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

Abstract

ASJC Scopus subject areas

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