Superconducting transition properties of grain boundaries in MgB2 films
- Authors
- Lee, Sung Hoon; Lee, Soon-Gul; Kang, Won Nam
- Issue Date
- 1월-2015
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- MgB2 superconductor; Intergrain nanobridge
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.66, no.1, pp.7 - 11
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 66
- Number
- 1
- Start Page
- 7
- End Page
- 11
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/94778
- DOI
- 10.3938/jkps.66.7
- ISSN
- 0374-4884
- Abstract
- The intergrain interface of unconventional superconductors suppresses the order parameter and, thus, serves as a bottleneck for the supercurrent. Such a characteristic of the grain interface is a major limiting factor for the lossless-current-carrying capacity of superconducting transmission lines on the one hand, but can also provide a clue to the development of Josephson elements on the other. We investigated the critical transition properties of the MgB2 intergrain nanobridges patterned by using a focused ion beam. The nanobridge containing a single intergrain interface had nominal dimensions of 200 E 300 nm in width and length. We studied the current-voltage characteristics, the temperature-dependent critical current, and the normal state resistance. The measured MgB2 interface properties showed a wide spectrum of the coupling strength, ranging from a weak Josephson coupling to a very strong coupling comparable to an intragranular one. The origins of such a variety of intergrain coupling strengths were analyzed in conjunction with the lattice structure at the grain interface.
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Collections - College of Science and Technology > Semiconductor Physics in Division of Display and Semiconductor Physics > 1. Journal Articles
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