Isotropic oxides Ca0.5Sr0.5RuO3 and La0.5Sr0.5CoO3 are metallic; ρ(T) is roughly linear and it reaches few hundred μωcm at room temperature. We have synthesized optical-quality thin films of these two materials and studied their reflectance, ellipsometric, and Raman spectra over a broad spectral range. Great resemblance is observed to the corresponding spectra of cuprate superconductors; in particular, reflectance decreases with frequency in a nearly linear fashion throughout the infrared, and the electronic Raman scattering continuum is nearly independent of energy. The 'anomalous' dielectric response described above is considered to be the route cause of high-Tc superconductivity in some theoretical models; however, neither of the two metals under study is superconducting at least down to 4.2 K.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering