Charge transfer-T{sub c} relation in the superconducting intercalates IBi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y}
- Seoul National Univ. (Korea, Republic of)
Two different kinds of stage-1 iodine intercalates of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 6} with dissimilar T{sub c} have been prepared in order to understand the relationship between superconducting properties and electronic structures. According to the XRD analysis and the magnetic susceptibility measurements, it is found that, in spite of the same basal increments for both intercalates ({Delta}d = {approximately} 3.6 {angstrom}), the iodine intercalate prepared in a vacuum-sealed tube exhibits a larger T{sub c} depression (13 K) compared to the iodine intercalate synthesized in air ({Delta}T{sub c} = 6 K). The origin of such different T{sub c} shifts has been investigated by performing the systematic XANES/EXAFS analyses at the I L{sub 1}-, Cu K-, and Bi L{sub 3}-edges, where the charge transfer between host and guest is found to be strongly dependent on the reaction condition. From the BVS calculation based on the Cu K-edge EXAFS results, it is clarified that there is an excellent correlation between the amount of hole doping and T{sub c} depression for both iodine intercalates. In this respect, they conclude that, regardless of lattice expansion along the c-axis, the T{sub c} of Bi-based cuprate is wholly dependent on the hole concentration of the CuO{sub 2} layer.
- OSTI ID:
- 642222
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 138; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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