Spatially resolved electrical characterization of a YBa2Cu3O7−δ flux transformer

Abstract

We report the spatially resolved transport properties of a three-layer YBa2Cu3O7−δ flux transformer using low-temperature scanning electron microscopy. The seven-turn spiral coil is fabricated using a crossover technology with SrTiO3 as an insulator. The different layers were patterned with shadow masks or optical lithography. We show that the insulating SrTiO3 film has no shorts and that the overlaying YBa2Cu3O7−δ spiral reveals a reduced zero resistance critical temperature at the steps and edges of the insulator.