Raman modes of the apical oxygen in mercury-based superconductors
In-Sang Yang, Hye-Gyong Lee, Nam H. Hur, Jaejun Yu
DOI 10.1103/PhysRevB.52.15078 · Physical Review B
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Abstract
Recent studies suggest that the apical oxygen plays an important role in high-Tc superconductivity of mercury-based superconductors HgBa2Can−1CunO2n+2+δ [Hg-12(n-1)n]. Among strong Raman peaks at ∼570 and ∼ 585 cm−1, the mode at ∼ 585 cm−1 has been determined to be the A1g mode of the apical oxygen. However, the origin of the mode near 570 cm−1 is still in question. In order to clarify the origin of the 570 cm−1 mode, we have carried out Raman measurements on the Hg1−xTlxBa2(Ca0.86Sr0.14)2Cu3O8+δ systems, where the amount of the oxygen in the Hg/Tl-O plane is controlled by the doping level of Tl ions. The results show that the 570 cm−1 peak does not arise from the modes of the interstitial oxygens in the Hg/Tl-O plane, but from the A1g-type mode of the apical oxygen. From our analysis, it is shown that the 570 cm−1 mode arises from the apical oxygen OA with the neighboring interstitial oxygen Oδ, while the 585 cm−1 mode is from the OA without the nearest Oδ neighbor. We conclude that the apical oxygens in the Hg-12(n-1)n systems can have two distinctive sets of Oδ environment.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Hg1-xTlxBa2(Ca0.86Sr0.14)2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 126 | Pressure not reported | unknown |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 165 | Pressure not reported | unknown |
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