Multilayer studies and applications in template bi_epitaxial dc SQUIDs

R.P.J. IJsselsteijn, Johannes W.M. Hilgenkamp, M. Eisenberg, D. Terpstra, Jakob Flokstra, Horst Rogalla

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Multilayer deposition for the creation of a well-defined grain boundary, based on different in-plane orientations of c-axis oriented thin YBa2O2Cu3O7-δ layers on a single substrate, has been performed on three different kinds of substrates: (1102)-oriented Al2O3 , (100) SrTiO3, and (100) MgO. The multilayers consist of combinations of SrTiO3, MgO, CeO2, and YBa2O2Cu3O7-δ. The YBa 2O2Cu3O7-δ top layers on (1102) Al2O3 and (100) SrTiO3 were polycrystalline. Josephson junctions and DC superconducting quantum interference devices (SQUIDs) have been structured in the layers on MgO. Shapiro steps were observed. The Jcρn-product of the junctions at 4.2 K is on the order of 1 mV. The critical current decreases in good approximation linearly with increasing temperature, whereas the normal state resistance is nearly temperature independent. Voltage modulation was observed at temperatures up to 77 K.
Original languageEnglish
Pages (from-to)2321-2324
Number of pages4
JournalIEEE transactions on applied superconductivity
Issue number1
Publication statusPublished - 1993
Event1992 Applied Superconductivity Conference, ASC 1992 - Chicago, United States
Duration: 23 Aug 199228 Aug 1992


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