Raman scattering from Ba2YCu3O7 above and below the 90-K superconducting transition: Evidence for oxygen vacancies in the Cu-O chains
Z. Iqbal, S. W. Steinhauser, A. Bose, N. Cipollini, H. Eckhardt
DOI 10.1103/PhysRevB.36.2283 · Physical Review B
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Abstract
Raman scattering data from different types of samples of the normal and superconducting phases of Ba2YCu3O7 (Tc≈90 K) and Ba2Y0.75Sc0.25 Cu2.4Ni0.6+2O7 (Tc≈65 K) are reported and assigned. A Raman line observed at 632 cm−1 is assigned to the stretching mode of the Cu-O chains. This mode is Raman inactive in the ordered O-deficient lattice but appears to be activated by oxygen vacancies along the chains. Another sample-dependent line is observed at 365 cm−1 which gains intensity below 150 K but disappears in the superconducting phase. In the Ni-alloyed material the Raman results suggest that the Ni2+ ions primarily occupy Cu sites in the Cu-O chains.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2YCu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | zero_resistance |
| Ba2YCu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 87 | Pressure unresolved | zero_resistance |
| Ba2Y0.75Sc0.25Cu2.4Ni0.6O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure unresolved | zero_resistance |
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