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Vibration of the apical oxygens in mercury-based superconductors 1
- Title
- Vibration of the apical oxygens in mercury-based superconductors 1
- Authors
- Yang I.-S.; Lee H.-G.
- Ewha Authors
- 양인상
- SCOPUS Author ID
- 양인상
- Issue Date
- 1996
- Journal Title
- Chinese Journal of Physics
- ISSN
- 0577-9073
- Citation
- Chinese Journal of Physics vol. 34, no. 2 II, pp. 479 - 483
- Indexed
- SCI; SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Mercury-based superconductors HgBa2Can-1CunO2n+2+δ, Hg-12(n-1)n, show strong Raman peaks at ∼ 570 cm-1 and ∼ 585 cm-1. The mode at ∼ 585 cm-1 is unambiguously the A1g mode of the apical oxygen OA. However, the origin of the mode at ∼ 570 cm-1 is still in question. In order to clarify the origin of the 570 cm-1 mode, we have done Raman measurements on the Tl-doped Hg-1223 samples, where the amount of the oxygen Oδ in the Hg/Tl-O plane is controlled by the doping level of Tl ions. The results show that the 570 cm-1 mode is not from the motion of Oδ, but from the A1g-type motion of OA- This is in contradiction with the factor group analysis of the ideal Hg-12(n-1)n structure with fully-empty or fully-occupied Oδ position, which shows that there is only one A1g mode for OA- The result indicates that, in the Hg12(n-1)n systems with partially-occupied Oδ, there are two possible environments for OA; one with Oδ(neighbors, the other without any nearest Oδ neighbor. © 1996 THE PHYSICAL SOCIETY OF THE REPUBLIC OF CHINA.
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- 자연과학대학 > 물리학전공 > Journal papers
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