X-ray absorption spectroscopic study of new high-{Tc} superconducting intercalation compound of (HgX{sub 2}){sub 0.5}Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y} (X = Br,I)
- Seoul National Univ. (Korea, Republic of)
The authors have systematically performed X-ray absorption spectroscopic (XAS) studies on the new mercuric halide intercalated superconductors, (HgX{sub 2}){sub 0.5}Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y} with X = Br and I, in order to investigate the electronic and crystal structure of these compounds. The present Hg L{sub 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{sub 2}-intercalate and 2.65 {angstrom} for the HgI{sub 2}-one. This is the first example of linear molecular salt of HgX{sub 2} stabilized in the solid lattice. According to the I L{sub I}- and Br K-edge X-ray absorption near edge structure (XANES) spectroscopic studies, a small amount of electron transfer from the intercalant HgX{sub 2} to the host lattice could be observed upon intercalation, resulting in the negatively charged state of (HgX{sub 2}){sup {delta}{minus}}. The Cu K-edge EXAFS analysis reveals that the bond distance of Cu-O{sub axial} is slightly shortened upon intercalation, reflecting the oxidation of (Cu-O) layer, which is well consistent with the I L{sub I}- and Br K-edge XANES results.
- OSTI ID:
- 549858
- Report Number(s):
- CONF-960163-; ISBN 0-8194-2070-0; TRN: 98:000480
- Resource Relation:
- Conference: Photonics West `96: conference on quantum well and superlattice physics VI, San Jose, CA (United States), 27 Jan - 2 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Spectroscopic studies of superconductors. Part B: Tunneling, photoelectron, and other spectra; Bozovic, I.; Marel, D. van der [eds.]; PB: 370 p.; Proceedings/SPIE, Volume 2696
- Country of Publication:
- United States
- Language:
- English
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