Growth characteristics of HgBa2CaCu2O6 superconducting films on CeO2-buffered YSZ single crystals: An assessment for coated conductors

T. Aytug, Y. Y. Xie, J. Z. Wu, D. K. Christen

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Abstract

Superconducting HgBa2CaCu2O6 (Hg-1212) films have been fabricated on CeO2-buffered YSZ single-crystal substrates using a two-step cation-exchange process. X-ray diffraction analyses show that the Hg-1212 films are highly crystalline and grow epitaxially on these CeO2/YSZ substrates. Although the superconducting transition temperatures (Tc) of these films are approximately 122 K, the critical current densities (Jc) fall far below the expected values. The reason for these low-Jc values is explained by the observations of a cracked surface morphology in the superconducting layers. The likely mechanism for formation of the cracks and implications for the development of Hg-based coated conductors are discussed.

Original languageEnglish
Pages (from-to)107-112
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Volume363
Issue number2
DOIs
StatePublished - Nov 1 2001

Funding

This work was supported by the US Department of Energy, Division of Materials Sciences, Office of Science, Office of Power Technologies-Superconductivity Program, Office of Energy Efficiency and Renewable Energy. The research was performed at the Oak Ridge National Laboratory, managed by UT-Battelle, LLC for the USDOE under contract no. DE-AC05-00OR22725. T. Aytug and J.Z. Wu would like to acknowledge NSF grant no. DMR-9901460 and AFOSR grant no. F49620-96-1-0358.

Keywords

  • Buffer layers
  • Coated conductors
  • Hg-1212
  • High-temperature superconductors

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