X-ray absorption spectroscopic study of new high-Tc superconducting intercalation compound of (HgX2)0,5Bi2Sr2CaCu 2Oy (X = Br, I)

J. H. Choy, S. J. Hwang

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Abstract

We have systematically performed X-ray absorption spectroscopic (XAS) studies on the new mercuric halide intercalated superconductors, (HgX2)0,5Bi2Sr2CaCu 2Oy with X = Br and I, in order to investigate the electronic and crystal structures of these compounds. According to the I LI- and Br K-edge X-ray absorption near edge structure (XANES) spectroscopic analyses, it is found that a small amount of electron is transferred from the intercalant HgX2 to the host lattice, resulting in the negatively charged state of (HgX2)δ.. The Cu K-edge extended X-ray absorption fine structure (EXAFS) analysis reveals that the bond distance of (Cu-Oaxial) is slightly shortened upon intercalation, reflecting the oxidation of CuO2 layer, which is well consistent with the I LI-and Br K-edge XANES results. On the other hand, 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 Å for the HgBr2-intercalate and 2.65 Å for the HgI2-one, respectively. This is the first example of linear molecular salt of HgX2 stabilized in the solid lattice.

Original languageEnglish
Pages (from-to)C2-1233-C2-1234
JournalJournal De Physique. IV : JP
Volume7
Issue number2 Part 2
Publication statusPublished - 1997

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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