We have fabricated sub-micron intrinsic Josephson junctions in thin films of Tl-Ba-Ca-Cu-O using two differing techniques suited to different applications. By using lateral focussed ion-beam milling we have created arrays of intrinsic junctions in c-axis oriented films. Such arrays, with areas as low as 0.25 mum(2), display large hysteresis comparable to that observed in single-crystal intrinsic junctions. By using normal focussed ion-beam milling we have created arrays in mis-aligned films grown on vicinal substrates. In arrays of area less than 0.4 mum(2) we observe Josephson phase diffusion and a suppressed critical current, showing that charging effects may be significant in these junctions.
|Number of pages||4|
|Journal||IEEE Transactions on Applied Superconductivity|
|Publication status||Published - Jun 2003|
|Event||Applied Superconductivity Conference - HOUSTON, United Kingdom|
Duration: 4 Aug 2002 → 9 Aug 2002
- focussed ion-beam milling
- Josephson junctions