Polarized X-Ray Absorption Spectroscopic Study on Mercuric Bromide Intercalated Bi₂Sr₂CaCu₂O_y Single Crystal

Authors: Hwang S-J.; Choy J-H.

Source: Journal of Solid State Chemistry, Volume 160, Number 1, August 2001 , pp. 39-44(6)

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Abstract:

Polarized X-ray absorption spectroscopic experiments have been carried out for the mercuric bromide intercalated Bi₂Sr₂CaCu₂O_y single crystal, in order to understand the variation of anisotropic resistivities upon HgBr₂ intercalation as well as to probe the electronic structure of HgBr₂ intercalate. The Br K- and Bi L_III-edge spectra indicate a significant electron transfer from bismuth to bromine, implying an overlap between Bi 6s and Br 4p orbitals. From the Hg L_III- and Br K-edge data, it is also found that HgBr₂ intercalation gives rise to an electron localization in the (Hg–Br) bond, which leads to poor electronic conduction along the intercalant layer. In this context, the semiconducting out-of-plane resistivity of HgBr₂ intercalate can be explained by the poor conductivity of the intercalated HgBr₂ layer, even though the orbital overlap between Bi and Br facilitates the electron conduction between host and guest along the c-axis. Copyright 2001 Academic Press.