Coexistence of superconductivity and density wave in Ba2Ti2Fe2As4O: An optical spectroscopy study
H. P. Wang, Y. L. Sun, X. B. Wang, Y. Huang, T. Dong, R. Y. Chen, G. H. Cao, N. L. Wang
DOI 10.1103/PhysRevB.90.144508 · Physical Review B
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Abstract
We performed an optical spectroscopy measurement on single crystals of Ba2Ti2Fe2As4O, which is a newly discovered superconductor showing a coexistence of superconductivity and density wave orders. The study reveals spectral changes associated with both density wave and superconductivity phase transitions. The density wave phase transition at TDW≈125 K leads to the reconstruction of Fermi surfaces which removes about half of Drude spectral weight. The ratio of 2ΔDW/kBTDW≈11.9 is considerably larger than the mean-field value based on the weak-coupling BCS theory. At the lowest temperature in the superconducting state, further spectral change associated with the superconducting condensate is observed. The low frequency optical conductivity could be well modeled within the Mattis-Bardeen approach with two isotropic gaps of Δ1(0)=3.4 meV and Δ2(0)=7.9 meV. The superconducting properties of the Ba2Ti2Fe2As4O compound are similar to those of BaFe1.85Co0.15As2.
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. | 21.5 | Pressure not reported | onset |
| 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 |
| BaFe1.85Co0.15As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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