Title :
NdBa2Cu3O7 bicrystal Josephson junctions and SQUIDs operating at 77 K
Author :
Romans, E.J. ; Eulenburg, A. ; Carr, C. ; Millar, A.J. ; Donaldson, G.B. ; Pegrum, C.M.
Author_Institution :
Dept. of Phys. & Appl. Phys., Strathclyde Univ., Glasgow, UK
fDate :
3/1/2001 12:00:00 AM
Abstract :
Recently there has been considerable interest in the use of NdBa 2Cu3O7 (NBCO) as an alternative thin-film material to YBa2Cu3O7 (YBCO) for device applications. This is due to the its potentially superior surface and structural properties. However the development of NBCO Josephson junctions and superconducting quantum interference devices (SQUIDs) has been found difficult worldwide due to the degradation in the transition temperature upon patterning. This effect appears to be target dependent. By careful patterning and annealing of samples we have been able to obtain working NBCO Josephson junctions and SQUIDs at 77 K. Here we report on their electrical and noise characteristics
Keywords :
Josephson effect; SQUIDs; annealing; barium compounds; bicrystals; critical currents; high-temperature superconductors; neodymium compounds; pulsed laser deposition; superconducting device noise; superconducting thin films; superconducting transition temperature; 77 K; NdBa2Cu3O7; NdBa2Cu3O7 bicrystal Josephson junctions; SQUIDs; SrTiO3; annealing; critical current; electrical characteristics; magnetic flux noise; noise characteristics; patterning; pulsed laser deposition; superconducting quantum interference devices; thin-film material; transition temperature degradation; Degradation; Interference; Josephson junctions; SQUIDs; Superconducting devices; Superconducting materials; Superconducting thin films; Superconducting transition temperature; Thin film devices; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
