X-Ray Absorption Spectroscopic Study of New High-Tc Superconducting Intercalation Compound of HgX20,5Bi2Sr2CaCu2Oy X = Br, IReportar como inadecuado




X-Ray Absorption Spectroscopic Study of New High-Tc Superconducting Intercalation Compound of HgX20,5Bi2Sr2CaCu2Oy X = Br, I - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.



Abstract : We have systematically performed X-ray absorption spectroscopic XAS studies on the new mercuric halide intercalated superconductors, HgX20.5Bi2Sr2CaCu2Oy 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 HgX2δ-. 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.





Autor: J.-H. Choy S.-J. Hwang

Fuente: https://hal.archives-ouvertes.fr/



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