We have systematically applied the intercalation technique to the layered superconducting oxides in order not only to develop a new high-Tc superconducting nanohybrid, but also to investigate the mechanism responsible for high-Tc superconductivity. In the light of the Lewis acid-base concept, we have recently synthesized new types of high-Tc superconducting intercalation compounds: M-X-Bi2Sr2Can-1CunOy (M = Hg,Ag; X = Br,I; n = 1,2). According to X-ray absorption spectroscopic analysis, intercalated HgX2 is stabilized in a molecular form with linear symmetry, which is the first example of molecular HgX2 in a solid matrix, and the intercalated AgI has an α-AgI-like structure with distorted tetrahedral symmetry, which is consistent with the significant rapid ionic conductivity of AgI-intercalate in the temperature domain 25-300°C.
Bibliographical noteFunding Information:
This work was supported, in part, by the Ministry of Science and Technology for high temperature superconductivity research and by the Korea Science and Engineering Foundation through the Center for Molecular Catalysis. The authors are grateful to Prof. M. Nomura for helping us to obtain the XAS data at the Photon Factory.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics