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Science 15 July 1994:
Vol. 265. no. 5170, pp. 380 - 383
DOI: 10.1126/science.265.5170.380
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Articles

Synthesis and Properties of a Cuprate Superconductor Containing Double Mercury-Oxygen Layers

P. G. Radaelli 1, M. Perroux 1, M. Marezio 2, S. de Brion 3, J. L. Tholence 3, Q. Huang 4, and A. Santoro 4

1 Laboratoire de Cristallographie, CNRS/UJF, BP 166,38042 Grenoble Cedex 09, France
2 Laboratoire de Cristallographie, CNRS/UJF, BP 166, 38042 Grenoble Cedex 09, France, and AT& T Bell Laboratories, Murray Hill, NJ 07974, USA.
3 Centre de Recherche sur les Très Basses Tèmperatures, CNRS/UJF, BP 166, 38042 Grenoble Cedex 09, France
4 National Institute of Standards and Technology, Reactor Division, Gaithersburg, MD 20899, USA.

A cuprate superconductor containing double mercury layers was synthesized with a high-pressure, high-temperature technique. The compound, with chemical formula Hg2Ba2-Y1-xCaxCu2O8-dgr, contains a double HgO layer with structure similar to that of rock salt. The prototype compound Hg2Ba2YCu2O8-dgr is an insulator. Superconductivity is induced in the system by partially replacing yttrium with calcium.

Submitted on April 1, 1994
Accepted on May 18, 1994

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Science. ISSN 0036-8075 (print), 1095-9203 (online)