Superconducting YBa2Cu3O7−δ thin films on GaAs with conducting indium-tin-oxide buffer layers

Abstract
Superconducting YBa2Cu3O7−δ (YBCO) thin films have been grown in situ on GaAs with conducting indium‐tin‐oxide (ITO) buffer layers. Superconducting onset is about 92 K with zero resistance at 60 K. ITO buffer layers usually form Schottky‐like barriers on GaAs. The YBCO film and ITO buffer layer, grown by ion beam sputter codeposition, are textured and polycrystalline with a combined room‐temperature resistivity of about 1 mΩ cm.