Cation exchange: synthesis and epitaxy of Hg-based superconducting thin films via atomic perturbations

Judy Z. Wu

doi:10.1117/12.397864

6 September 2000 Cation exchange: synthesis and epitaxy of Hg-based superconducting thin films via atomic perturbations

Judy Z. Wu

Proceedings Volume 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV; (2000) https://doi.org/10.1117/12.397864
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

A novel cation-exchange process has been developed for synthesis of bulks and epitaxy of thin films of highly volatile Hg-based high- temperature superconductors (Hg-HTS's). Unlike in a conventional thermal reaction process, precursor matrices of Tl-based high- temperature superconductors were employed in the cation exchange process and annealed in Hg vapors, in which Tl cations were perturbed thermally and replaced subsequently by the Hg cations. A large processing window has been observed suitable for such an atomic perturbation process. This allows Hg-HTS's to inherit high- quality crystalline structures, surface and film/substrate interface morphologies from their Tl-HTS's precursor matrices, eliminating difficulties in synthesis and epitaxy of Hg-HTS's associated with the high volatility of Hg-related compounds. Nearly pure phase HgBa₂CaCu₂O_6+(delta ) and HgBa₂Ca₂Cu₃O_8+(delta )bulks and epitaxial thin films were obtained reproducibly with exciting physical properties including high T_c's, high J_c's, and low microwave surface resistance. This cation-exchange technique may also provide a general scheme for synthesis of other volatile compounds with pre-designed structure and composition.

Citation Download Citation

Judy Z. Wu "Cation exchange: synthesis and epitaxy of Hg-based superconducting thin films via atomic perturbations", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); https://doi.org/10.1117/12.397864

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