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Properties of $MgB_2$ Intragrain Nanobridges
홍성학,이순걸,성원경,강원남,김동호,김영국,정국채,Hong, Sung-Hak,Lee, Soon-Gul,Seong, Won-Kyung,Kang, Won-Nam,Kim, Dong-Ho,Kim, Young-Kuk,Chung, Kook-Chae The Korean Superconductivity Society 2009 Progress in superconductivity Vol.10 No.2
Inter-grain nanobridges of the $MgB_2$ superconductor have been fabricated by focused-ion-beam(FIB) and their electrical transport properties were studied. The $MgB_2$ film was prepatterned into microbridges by a standard argon ion milling technique and then FIB-patterned into 100 nm$\times$100 nm bridges. Current-voltage characteristics showed a strong flux-flow type behavior at all temperatures with a trait of Josephson coupling near $T_c$. 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 $I_c(T){\propto}(1-T/T_c)^2$ near $T_c$, same as a normal barrier junction, and $I_c(T){\propto}(1-T/T_c)^{1.2}$ at low temperatures, similar to that of a film.