The reflection spectra of polycrystalline RuSr2GdCu2O8 are reported in the frequency range 25-5000 cm-1 and temperatures between 10 and 300 K. The material exhibits a metallic behavior over the whole temperature range. No superconductivity related features were detected in the low frequency infrared response despite the observed zero resistance below Tc=32 K. A rather low reflection level at frequencies above 800 cm-1 suggests a strongly overdamped free charge carrier response. Six of the seven A2u phonon modes, predicted by group theoretical analysis, were observed experimentally and assigned to the definite c-axis eigenmodes by a comparison of the experimental frequencies with the results of lattice dynamical calculations. One of the CuO2 plane-oxygen related modes exhibits pronounced anomalous softening upon decreasing temperature in the normal state.
|頁（從 - 到）||9709-9712|
|期刊||Physical Review B - Condensed Matter and Materials Physics|
|出版狀態||Published - 2000 10月 1|
All Science Journal Classification (ASJC) codes