High-frequency Raman scattering in the superconducting and semiconducting phases of Ba2YCu3Ox-type single crystals and ceramics
D. M. Krol, M. Stavola, L. F. Schneemeyer, J. V. Waszczak, H. O'Bryan, S. A. Sunshine
DOI 10.1103/PhysRevB.38.11346 · Physical Review B
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Abstract
We report the high-frequency Raman spectra (Δω>1000 cm−1) of Ba2YCu3Ox and various analogs, measured at room temperature. In semiconducting single crystals and ceramics of Ba2YCu3Ox (x≈6) and semiconducting single crystals of Sr2YCu2.4Al0.6Ox we find a peak at 1220 cm−1 (A1g symmetry) and a broadband at 2600 cm−1 (B1g). The 1220-cm−1 peak can be interpreted as scattering from excitations of single spins near defects or two-phonon scattering. The 2600-cm−1 band is attributed to scattering from spin-pair excitations. In the spectra of superconducting Ba2YCu3Ox crystals and ceramics (x≈7) these bands are not present. In all samples, semiconductors and superconductors, we observe flat and featureless spectral intensity (A1g symmetry) extending up to Δω=5000 cm−1, the origin of which is not understood at present. The similarity between the high-frequency spectra of Ba2YCu3Ox (x∼6) and Sr2YCu2.4Al0.6Ox [Al on Cu(1)-chain sites] shows that the magnetic scattering is determined by the structure of the Cu(2)-O planes and is not affected by the distance between the planes or by the Cu(1)-chain structure.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2YCu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | unknown |
| Ba2YCu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
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