Raman spectroscopy of CaRuO3 -: art. no. 014101

We report on the polarized Raman spectra of untwinned single crystals of CaRuO3 (Ru4+) that reveal the phonon excitations in this compound. The observed Raman lines are assigned to definite atomic vibrations based on predictions of lattice dynamics calculations and by a comparison to the spectra of isostructural SrRuO3. Unlike some other Ru4+ compounds such as ferromagnetic SrRuO3 and antiferromagnetic Ca3Ru2O7, the temperature dependence of the Raman spectra shows no anomalies related to magnetic ordering. This result is in favor of paramagnetic or short-range spin-glass-type magnetic interactions in CaRuO3.