Step edge junctions on NdGaO3 substrates at 77 K

✍ Scribed by W. Jutzi; H. Matz; R. Dolata; R. Herwig; P. Marienhoff; M. Neuhaus; T. Scherer

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 331 KB
• Volume: 33
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(93)90122-5

✦ Synopsis

D.c. SQUIDS for liquid nitrogen operation are implemented with grain boundary Josephson junctions in off-axis sputtered Y1Ba2Cu30× stripes at step edges in NdGaO 3 substrates. The special properties of the Josephson junctions due to the excellent lattice match between the orthorhombic substrate and the YBCO stripes are described. The SQUID has a flux modulation up to temperatures very close to the critical temperature of the YBCO stripes beyond the edge. At 77 K the maximum slope is dU/dcb = 80/aV {o 1 and the product of the critical current times the tunnel resistance is IcRN = 40 #V.