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Proceedings Paper

X-ray absorption spectroscopic study of new high-Tc superconducting intercalation compound of (HgX2)0.5Bi2Sr2CaCu2Oy(X=Br,I)
Author(s): Jin-Ho Choy; Nam-Gyu Park; Seong-Ju Hwang; Sung-Ho Hwang; Dong-Hoon Kim
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Paper Abstract

We have systematically performed x-ray absorption spectroscopic (XAS) studies on the new mercuric halide intercalated superconductors, (HgX2)0.5Bi2Sr2CaCu2Oy with X equals Br and I, in order to investigate the electronic and crystal structure of these compounds. The present Hg LIII-edge EXAFS results indicate that the mercury is coordinated with two bromide or iodide ligands with bond length of 2.46 angstrom for the HgBr2-intercalate and 2.65 angstrom for the HgI2-one. This is the first example of linear molecular salt of HgX2 stabilized in the solid lattice. According to the I LI- and Br K-edge x-ray absorption near edge structure (XANES) spectroscopic studies, a small amount of electron transfer from the intercalant HgX2 to the host lattice could be observed upon intercalation, resulting in the negatively charged state of (HgX2)(delta -). The Cu K-edge EXAFS analysis reveals that the bond distance of Cu-Oaxial is slightly shortened upon intercalation, reflecting the oxidation of (Cu-O) layer, which is well consistent with the I LI- and Br K-edge XANES results.

Paper Details

Date Published: 10 June 1996
PDF: 6 pages
Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241786
Show Author Affiliations
Jin-Ho Choy, Seoul National Univ. (South Korea)
Nam-Gyu Park, Seoul National Univ. (South Korea)
Seong-Ju Hwang, Seoul National Univ. (South Korea)
Sung-Ho Hwang, Seoul National Univ. (South Korea)
Dong-Hoon Kim, Seoul National Univ. (South Korea)

Published in SPIE Proceedings Vol. 2696:
Spectroscopic Studies of Superconductors
Ivan Bozovic; Dirk van der Marel, Editor(s)

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