Improvement of Surface Morphology of Yttrium-Stabilized Zirconia Films Deposited by Pulsed Laser Deposition on Rolling Assisted Biaxially Textured Substrate Tapes

The surface morphology of buffer layer yttrium-stabilized zirconia（YSZ） of YBa2 Cu3 O7-σ（YBCO） high temperature superconducting films relies on a series of controllable experimental parameters.In this work,we focus on the influence of pulsed laser frequency and target crystalline type on surface morphology of YSZ Sims deposited by pulsed laser deposition（PLD） on rolling assisted biaxially textured substrate tapes.Usually two kinds of particles axe observed in the YSZ layer:randomly distributed ones on the whole Sim and self-assembled ones along grain boundaries.SEM images are used to prove that particles can be partly removed when choosing dense targets of single crystalline.Lower frequency of pulsed laser also contributes to a smoother film surface.TEM images are used to view the crystalline structure of thin Sim.Thus we can obtain a basic understanding of how to prepare a particle-free YSZ buffer layer for YBCO in optimized conditions using PLD.The YBCO layer with nice structure and critical current density of around 5 MA/cm2 can be reached on smooth YSZ samples.