YBa${}_2$Cu${}_3$O${}_7$ nano-constriction Josephson junctions and SQUIDs fabricated by focused helium-ion-beam irradiation

Christoph Schmid, Christopher Buckreus, David Haas +9

By focused $30\mathrm{keV}$ He ion beam irradiation, epitaxially grown YBa${}_2$Cu${}_3$O${}_7$ (YBCO) thin films can be driven from the superconducting to the insulating state with in…