X-ray-absorption near-edge structure study ofIBi2Sr2

Polarized X-Ray Absorption Spectroscopic Study on Mercuric Bromide Intercalated Bi2Sr2CaCu2O Single Crystal

“…A closer comparison between both polarized spectra of the pristine Bi2212 reveals that the features B and C have higher energies with respect to the peaks B and C corresponding to the in-plane transitions, respectively. This observation can be explained by taking into account the local structure of Bi where there is a much shorter (Bi}O 1 ) axial bond (&1.9 A > ) with respect to the other bonds, resulting in the destabilization of d VX , d WX , and d X orbitals (11,26). On the basis of these assignments, we have examined the evolution of Bi electronic structure upon HgBr intercalation by comparing the spectra for the pristine Bi2212 and its HgBr intercalate.…”

“…transitions, while the peaks B and C in the ENc spectra are assigned as 2p (11). A closer comparison between both polarized spectra of the pristine Bi2212 reveals that the features B and C have higher energies with respect to the peaks B and C corresponding to the in-plane transitions, respectively.…”

“…It was found that the iodine intercalation dramatically alters the semiconducting c-axis resistivity of the pristine compound to the metallic one, whereas it has little in#uence on the in-plane conduction (8,9). Although theoretical models based on the interlayer coupling scheme cannot explain the variation of c-axis conduction upon iodine intercalation (8), the band calculation and X-ray absorption spectroscopic (XAS) results indicate that the chemical interaction between BiO layers becomes enhanced through the interaction between iodine and bismuth, leading to the metallization of c-axis resistivity (10,11).…”

A novel hybrid of high-Tc cuprate and paramagnetic organic radical

“…There have been reported that inorganic species can be intercalated into Bi-based high-T c cuprates [1 -4]. However, the incorporation of organic moiety [5][6][7] into the layered cuprate has tremendous advantages over inorganic species [1][2][3][4] for studying high-T c superconductivity as well as for creating new materials with unusual features, since organic compounds show the widest variety of geometric and chemical nature ranging from neutral molecules to various ions, even to free radicals. Although the evolution of T c in these intercalation compounds has been mainly attributed to a change in the electronic structure of CuO 2 plane, the micro-mechanism of T c enhancement or suppression is still an open question.…”

“…In this respect, it has been suggested that two-dimensional (2D) spin structure interrelated with the charge carrier density within the CuO 2 plane is of crucial importance for the superconducting transition as well as for the T c regulation. Intercalation chemistry applied to high-T c cuprate superconductors have provided a way of controlling the dimensionality as well as modifying the charge carrier density in the superconductively active CuO 2 layer [1][2][3][4][5][6][7]. There have been reported that inorganic species can be intercalated into Bi-based high-T c cuprates [1 -4].…”