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Proceedings Paper

Recent progress in Hg-based cuprates
Author(s): Hans Rudolph Ott; A. Schilling; Oliver Jeandupeux; J. D. Guo; M. Cantoni
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Paper Abstract

The recent discovery of superconductivity in HgBa2Cu04+8 below 94Kl) suggested the possibility of considerably enhanced critical temperatures Tc in similar compounds with more than one Cu-0 plane per unit cell of the crystal lattice. Attempts to synthesize the compounds HgBa2Cao-1Cun<<2n+2+a with n = 2, 3 or 4 (Hg-1212, Hg-1223 and Hg-1234) have been successful and maximum values of Tc exceeding 130K have been achieved2.3). Both x-ray and neutron-diffraction techniques have been used to investigate the structural aspects of these materials, determining lattice constants and, at least in some cases, the degree of partial occupation of oxygen-atom sites in the Hg planes and investigating sublattice disorder 4.5). High-resolution electron microscopy revealed the existence of perfectly ordered polytypes, formed by stackin~s of Hg-1212 and Hg-1223 unit cells along the c direction; corresponding c-axis constants of up to 188 A have been evaluated 6).

Paper Details

Date Published: 10 August 1994
PDF: 1 pages
Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); doi: 10.1117/12.182696
Show Author Affiliations
Hans Rudolph Ott, Swiss Federal Institute of Technology (Switzerland)
A. Schilling, Swiss Federal Institute of Technology (Switzerland)
Oliver Jeandupeux, Swiss Federal Institute of Technology (Switzerland)
J. D. Guo, Swiss Federal Institute of Technology (Switzerland)
M. Cantoni, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 2158:
Oxide Superconductor Physics and Nano-Engineering
Davor Pavuna; Ivan Bozovic, Editor(s)

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