Abstract
We present room-temperature Raman measurements of pressure-polymerized and compare them with the spectra of Rb in the orthorhombic phase. Although both materials were prepared according to two completely different routes the spectra show a surprising similarity with respect to mode positions and line splitting. We concluded from this that both materials, the uncharged pressure-polymerized and the rubidium-doped orthorhombic compound, have the same overall structure and the compounds can be considered as the doped species of the , polymerized using moderate low pressure and high temperatures. From a detailed comparison between both spectra mode shifting and line broadening as a consequence of the charge transfer was determined and electron-phonon coupling constants were estimated for the high-frequency and modes. The low values for the coupling constants compared to the ones in the can explain the lack of superconductivity in the compounds.
- Received 29 July 1996
DOI:https://doi.org/10.1103/PhysRevB.54.17486
©1996 American Physical Society