ab-plane optical spectra of iodine-intercalated Bi1.9Pb0.1Sr2CaCu2O8+δ: Normal and superconducting properties
H. L. Liu, D. B. Tanner, H. Berger, G. Margaritondo
DOI 10.1103/PhysRevB.59.8962 · Physical Review B
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Abstract
We report on the ab-plane optical reflectance of an iodine-intercalated Bi1.9Pb0.1Sr2CaCu2O8+δ single crystal in the 80–40 000 cm−1 (10 meV–5 eV) frequency range and at temperatures between 10 and 300 K. As compared to the iodine-free Bi2Sr2CaCu2O8+δ, we find that the visible-ultraviolet interband transitions are strongly modified after intercalation. Estimates of the low-frequency spectral weight indicate that there is an increase of hole concentration in the CuO2 planes. This behavior is a consequence of charge transfer between intercalated iodine atoms and the CuO2 sheets leading to an ionized iodine species. The ab-plane optical conductivity is analyzed in both the one-component and the two-component pictures, suggesting that the intercalated iodine does not have any significant effect on the in-plane scattering rate. In the superconducting state, a sum-rule evaluation finds that the superfluid contains about 25% of the total doping-induced, or nearly 86% of the free-carrier oscillator strength in the normal state. The value of the superconducting penetration depth is estimated to be 1980 Å, slightly larger than the 1860 Å found in iodine-free Bi2Sr2CaCu2O8+δ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi1.9Pb0.1Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | onset |
| Bi1.9Pb0.1Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | onset |
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