Polarized X-Ray Absorption Spectroscopic Study on Mercuric Bromide Intercalated Bi2Sr2CaCu2Oy Single Crystal
✍ Scribed by Seong-Ju Hwang; Jin-Ho Choy
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 328 KB
- Volume
- 160
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Polarized X-ray absorption spectroscopic experiments have been carried out for the mercuric bromide intercalated Bi 2 Sr 2 CaCu 2 O y single crystal, in order to understand the variation of anisotropic resistivities upon HgBr 2 intercalation as well as to probe the electronic structure of HgBr 2 intercalate. The Br K-and Bi L III -edge spectra indicate a signi5cant 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 HgBr 2 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 HgBr 2 intercalate can be explained by the poor conductivity of the intercalated HgBr 2 layer, even though the orbital overlap between Bi and Br facilitates the electron conduction between host and guest along the c-axis.