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

Research output: Contribution to journalConference article

Abstract

We have systematically performed x-ray absorption spectroscopic (XAS) studies on the new mercuric halide intercalated superconductors, (HgX 2) 0.5Bi 2Sr 2CaCu 2O 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 HgBr 2-intercalate and 2.65 angstrom for the HgI 2-one. This is the first example of linear molecular salt of HgX 2 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 HgX 2 to the host lattice could be observed upon intercalation, resulting in the negatively charged state of (HgX 2) δ. 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.

Original languageEnglish
Pages (from-to)636-641
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume2696
Issue number2/-
Publication statusPublished - 1996
EventSpectroscopic Studies of Superconductors. Part 2 (of 2) - San Jose, CA, USA
Duration: 1996 Jan 291996 Feb 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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