Variations of the crystal structure, superconductivity, thermoelectric power and magnetic susceptibility with the iodine concentration x have been investigated for iodine-intercalated Bi2Sr2CaCu2O8+δ Ix with 0 ≤ x ≤ 1, using sintered samples of Bi2Sr2CaCu2O8+δ with three different values of 8 for the host samples. It has been concluded that the strange x dependence of Tc is mainly due to the x dependence of the hole concentration in the CuO2 sheets p, owing to charge transfer from iodine to the CuO2 sheets, and that the value of p has an upper limit in the Bi-2212 phase. The amount of holes transferred from iodine to the host material has been estimated as 0.18–0.35 per iodine, suggesting that iodine is intercalated predominantly in the form of I3− molecules.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering