YBa2Cu3O7-x films on flexible, partially stabilized zirconia substrates with fully stabilized zirconia buffer layers
Harshavardhan, K.S., Ramamoorthy Ramesh, T.S. Ravi, S. Sampere, A. Inam, C.C. Chang, G. Hull, M. Rajeswari, T. Sands, T. Venkatesan, M. Reeves, J.E. Tkaczyk, K.W. Lay
Textured polycrystalline YBCO films with superconducting transition temperatures of ∼90 K have been prepared on flexible zirconia substrates, partially stabilized by 3 mol % yttria. X-ray data suggest undesirable (013) and [(110) (103)] texture in minor amounts within the predominantly c-axis oriented film. The transmission electron microscope data reveal clean, special crystallographic as well as silicon contaminated grain boundaries containing amorphous phases. By depositing a zirconia buffer layer, fully stabilized by 9 mol % yttria, we have demonstrated that the normal-state metallic and superconducting properties of the YBCO films can be considerably improved. These films exhibit critical-current densities of ∼0.9×104 A/cm2 at 77 K in zero field and 2×105 A/cm 2 at 4.2 K in zero field.
Applied Physics Letters
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