Infrared reflectivity and vibrational structure of superconducting Bi2Sr2CaCu2O8+x
Oscar E. Piro, J. A. Güida, N. E. Massa, P. J. Aymonino, E. E. Castellano, H. C. Basso, J. N. H. Gallo, A. A. Martin
DOI 10.1103/PhysRevB.39.7255 · Physical Review B
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Abstract
We report the room-temperature infrared (ir) reflectance spectrum and the Kramers-Kronig imaginary dielectric function (ε’’) of the Bi2Sr2CaCu2O8+x (2:2:1:2) superconductor (Tc=82 K) in the 250–1000 cm−1 region. ε’’ shows phononlike maxima at 276, 316, 347, 361, and 600 cm−1. Several spectral features are similar to those found in 1:2:3-type materials including superconducting MBa2Cu3O7−x and semiconducting MBa2Cu3O6 (M=Y or some rare-earth element), as expected from their closely related perovskitelike crystal structures. The correlation existing between a factor group analysis of the Γ point phonons in 2:2:1:2 and 1:2:3 compounds affords a tentative assignment of ir-active modes in the bismuth superconductor by comparison with reported data in 1:2:3 materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82 | Pressure not reported | zero_resistance |
| TmBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
| Tl2Ba2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | unknown |
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