The electrical properties of sputtered YBa₂Cu₃O_{7- delta}thin films deposited onto (110) SrTiO₃substrates

Abstract

YBa2Cu3O7- delta thin films have been fabricated onto (110)SrTiO3 substrates using an RF magnetron sputtering technique and a film growth temperature of 700 degrees C. The authors have measured the current-voltage characteristics of these films over a range of temperatures and magnetic fields, and determined the effect of varying the current direction, and of varying the direction of the magnetic field. They have found marked anisotropy in the current-voltage characteristics with current direction. The angular dependence of the influence of the magnetic field is of a different character depending on whether it is rotated in the plane containing the (-110) and (110) substrate directions or whether it is rotated in the plane containing the (001) and (110) substrate directions. They present evidence in favour of a (103) normal orientation for their films, and discuss the expected effect of this structure on the anisotropy.