MgB2 결정립 나노브릿지 특성에 관한 연구Properties of MgB2 Intragrain Nanobridges
- Other Titles
- Properties of MgB2 Intragrain Nanobridges
- Authors
- 홍성학; 성원경; 강원남; 김동호; 김영국; 이순걸; 정국채
- Issue Date
- 2009
- Publisher
- 한국초전도학회
- Keywords
- MgB2; superconducting nanobridge; focused-ion-beam
- Citation
- Progress in Superconductivity, v.10, no.2, pp.74 - 78
- Indexed
- KCI
OTHER
- Journal Title
- Progress in Superconductivity
- Volume
- 10
- Number
- 2
- Start Page
- 74
- End Page
- 78
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/121230
- ISSN
- 1229-4764
- Abstract
- Inter-grain nanobridges of the MgB2 superconductor have been fabricated by focused-ion-beam (FIB) and their electrical transport properties were studied. The MgB2 film was prepatterned into microbridges by a standard argon ion milling technique and then FIB-patterned into 100 nm x 100 nm bridges. Current-voltage characteristics showed a strong flux-flow type behavior at all temperatures with a trait of Josephson coupling near Tc. At low temperatures, the curves showed a two-step resistance-doubled transition with occasional hysteresis. The resistance-doubling transition is believed to be due to a two-channel flux-flow effect. The temperature-dependent critical current data showed Ic(T) ∝ (1-T/Tc)2 near Tc, same as a normal barrier junction, and Ic(T) ∝ (1-T/Tc)1.2 at low temperatures, similar to that of a film.
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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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