| Autor: |
Poulakis, N, Lampakis, D, Liarokapis, E, Yoshikawa, A, Shimoyama, J, Kishio, K, Peacock, GB, Hodges, JP, Gameson, I, Edwards, PP, Panagopoulos, C |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Popis: |
A comparative Raman study of Re-free and Re-doped HgBa2Can-1CunO2n+2+δ with n=1,3,4,5 is presented in an attempt to further clarify the structural and phononic modifications brought about by Re substitution. A number of extra high-frequency phonon peaks show up in the spectra of the Re-doped samples and are attributed to the oxygen modes of a strongly bound, almost decoupled ReO6 octahedron. As regards the apex oxygen in the Hg site, a clear transfer of spectral weight from the 590 to the 570 cm-1 apex phonon band is observed upon Re substitution. Such a change may well be accounted for assuming increased excess oxygen content for the Re-doped samples. Another interesting result is the enhancement upon Re doping of a narrow peak probably attributed to c-axis vibrations of Ba whose frequency shows a distinctive change with the number n of the CuO2 layers, providing an easy way to identify the various phases in a sample. ©1999 The American Physical Society. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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