Optical conductivity and infrared-active phonons in RuSr2GdCu2O8

A. P. Litvinchuk, M. N. Iliev, Y. Y. Xue, R. L. Meng, C. W. Chu, V. N. Popov

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9 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)9709-9712
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
Publication statusPublished - 2000 Oct 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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