Midgap state-based π-junctions for digital applications

Testa, G.; Monaco, A.; Esposito, E.; Sarnelli, E.; Kang, D.-J.; Mennema, S. H.; Tarte, E. J.; Blamire, M. G.
August 2004
Applied Physics Letters;8/16/2004, Vol. 85 Issue 7, p1202
Academic Journal
Midgap state-based YBa2Cu3O7-x π-junctions have been fabricated by a focused ion-beam system using 45° symmetric [001] tilt SrTiO3 bicrystal substrates. Measurements, performed by inserting the junctions in a superconducting loop (as a double-phase sensitive test), show both an unconventional nonmonotonic temperature dependence of the Josephson current, with a local minimum at a crossover temperature T* and, around T*, a half flux quantum shift in the critical current versus magnetic field modulations, clear signs of a 0–π crossover with temperature. Such results demonstrate that conventional 45° symmetric grain boundary junctions may have potential for applications, from digital circuits to quantum computing.


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