Raman scattering investigation of superconducting Ba2Ti2Fe2As4O
S.-F. Wu, P. Richard, W.-L. Zhang, C.-S. Lian, Y.-L. Sun, G.-H. Cao, J.-T. Wang, H. Ding
DOI 10.1103/PhysRevB.89.134522 · Physical Review B
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Abstract
We have performed polarized Raman scattering measurements on the newly discovered superconductor Ba2Ti2Fe2As4O (Tc=21 K). We observe seven out of eight Raman active modes, with frequencies in good accordance with first-principles calculations. The phonon spectra suggest neither strong electron-phonon nor spin-phonon coupling and vary only slightly with temperature, except for one Eg mode associated with large displacements of As atoms near the Ti2O planes. We also identify a small anomaly around 125 K in the linewidth of an A1g mode involving the same As atoms. Our results suggest that the transition at 125 K is most likely driven by electronic interactions taking place in the Ti2O planes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2Ti2Fe2As4O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | unknown |
| BaTi2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure not reported | unknown |
| Ba1-xNaxTi2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.5 | Pressure not reported | unknown |
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