| Autor: |
Reznik, D., Lokshin, K., Mitchell, D. C., Parshall, D., Dmowski, W., Lamago, D., Heid, R., Bohnen, K. -P., Sefat, A. S., McGuire, M. A., Sales, B. C., Mandrus, D. G., Asubedi, A., Singh, D. J., Alatas, A., Upton, M. H., Said, A. H., Shvyd'ko, Yu., Egami, T. |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. B 80, 214534 (2009) |
| Druh dokumentu: |
Working Paper |
| Popis: |
In Fe-As based superconductors magnetism and superconductivity show strong sensitivity to the lattice, suggesting a possibility of unconventional electron-phonon coupling. We investigated c-axis polarized phonons in doped and undoped BaFe2As2 by inelastic X-ray scattering. Phonon peak positions and linewidths did not vary significantly as a function of doping either by Co or by K. The linewidth of the Fe vibration shows unusual wavevector-dependence, which may be due to hybridization with in-plane modes. Comparison with the density functional theory shows significant difference for the energy of the As-As vibrations (Raman active at the zone center) but not for the Fe-As vibrations (infrared-active at the zone center). This behavior cannot be explained by a 10% softening of Fe-As interaction strength as proposed previously for in-plane polarized vibrations. |
| Databáze: |
arXiv |
| Externí odkaz: |
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