Samanta, S. B. ; Narayan, H. ; Gupta, A. ; Narlikar, A. V. ; Muranaka, T. ; Akimitsu, J. (2002) Grain boundaries as weak links: the case of MgB2 with reference to YNi2B2C Physical Review B: Condensed Matter and Materials Physics, 65 (9). 092510_1-092510_3. ISSN 1098-0121
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Official URL: http://prb.aps.org/abstract/PRB/v65/i9/e092510
Related URL: http://dx.doi.org/10.1103/PhysRevB.65.092510
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 YNi2B2C having GB's (average width ∼30 Å) that are quasi-insulating in nature have also been presented and compared with the former.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 32737 |
| Deposited On: | 25 Jun 2011 13:59 |
| Last Modified: | 25 Jun 2011 13:59 |
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