Abstract
We have fabricated a superconducting nanobridge from an YBa 2Cu 3O 7 thin film by a focused ion beam method. The bridge was patterned from a 3-μm-wide YBa 2Cu 3O 7 line which was predefined by argon ion milling with a photoresist mask. A 300-nm-wide and 200 nm-thick bridge was patterned by milling nanotrenches in the superconducting bridge. Current–voltage characteristics showed typical resistively-shunted-junction properties. The temperature-dependent critical current was I c( T) ∼ (1 − T/ T c) 1 and the normal state resistance R N( T) increased with decreasing temperature, both of which are typical to a superconductor–insulator–superconductor junction. Those characteristics are believed to be due to naturally formed grain boundaries crossing the bridges.
Published Version
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