Recent progress in Hg-based cuprates

Hans Rudolph Ott; A. Schilling; Oliver Jeandupeux; J. D. Guo; M. Cantoni

doi:10.1117/12.182696

10 August 1994 Recent progress in Hg-based cuprates

Hans Rudolph Ott, A. Schilling, Oliver Jeandupeux, J. D. Guo, M. Cantoni

Proceedings Volume 2158, Oxide Superconductor Physics and Nano-Engineering; (1994) https://doi.org/10.1117/12.182696
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

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).

Citation Download Citation

Hans Rudolph Ott, A. Schilling, Oliver Jeandupeux, J. D. Guo, and M. Cantoni "Recent progress in Hg-based cuprates", Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); https://doi.org/10.1117/12.182696

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