YBa2Cu3O7 grain boundary junctions and low-noise superconducting quantum interference devices patterned by a focused ion beam down to 80 nm linewidth

J. Nagel, K. B. Konovalenko, M. Kemmler +8

YBa${}_2$Cu${}_3$O${}_7$ 24${}^{\circ }$ (30${}^{\circ }$) bicrystal grain boundary junctions (GBJs), shunted with 60\,nm (20\,nm) thick Au, were fabricated by focused ion beam milling with widths…