X-ray absorption spectroscopic study of new high-Tc superconducting intercalation compound of (HgX2)0.5Bi2Sr2CaCu2Oy(X=Br,I)

Jin-Ho Choy; Nam-Gyu Park; Seong-Ju Hwang; Sung-Ho Hwang; Dong-Hoon Kim

doi:10.1117/12.241786

10 June 1996 X-ray absorption spectroscopic study of new high-Tc superconducting intercalation compound of (HgX₂)_0.5Bi₂Sr₂CaCu₂O_y (X=Br,I)

Jin-Ho Choy, Nam-Gyu Park, Seong-Ju Hwang, Sung-Ho Hwang, Dong-Hoon Kim

Author Affiliations +

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241786
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

We have systematically performed x-ray absorption spectroscopic (XAS) studies on the new mercuric halide intercalated superconductors, (HgX₂)_0.5Bi₂Sr₂CaCu₂O_y with X equals Br and I, in order to investigate the electronic and crystal structure of these compounds. The present Hg L_III-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 L_I- 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-O_axial is slightly shortened upon intercalation, reflecting the oxidation of (Cu-O) layer, which is well consistent with the I L_I- and Br K-edge XANES results.

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Jin-Ho Choy, Nam-Gyu Park, Seong-Ju Hwang, Sung-Ho Hwang, and Dong-Hoon Kim "X-ray absorption spectroscopic study of new high-Tc superconducting intercalation compound of (HgX₂)_0.5Bi₂Sr₂CaCu₂O_y (X=Br,I)", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241786

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