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Proceedings Paper

Cation exchange: synthesis and epitaxy of Hg-based superconducting thin films via atomic perturbations
Author(s): Judy Z. Wu
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Paper 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 HgBa2CaCu2O6+(delta ) and HgBa2Ca2Cu3O8+(delta )bulks and epitaxial thin films were obtained reproducibly with exciting physical properties including high Tc's, high Jc'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.

Paper Details

Date Published: 6 September 2000
PDF: 11 pages
Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); doi: 10.1117/12.397864
Show Author Affiliations
Judy Z. Wu, Univ. of Kansas (United States)

Published in SPIE Proceedings Vol. 4058:
Superconducting and Related Oxides: Physics and Nanoengineering IV
Davor Pavuna; Ivan Bozovic, Editor(s)

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