American Physical Society
We combine the results of terahertz time-domain spectroscopy with far-infrared transmission and reflectivity to obtain the conductivity of SrRuO 3 over an unprecedented continuous range in frequency, allowing us to characterize the approach to zero frequency as a function of temperature. We show that the conductivity follows a simple phenomenological form, with an analytic structure fundamentally different from that predicted by the standard theory of metals.
Dodge, J. S., Weber, C. P., Corson, J., Orenstein, J., Schlesinger, Z., Reiner, J. W., & Beasley, M. R. (2000). Low-Frequency Crossover of the Fractional Power-Law Conductivity in SrRuO3. Physical Review Letters, 85(23), 4932–4935. https://doi.org/10.1103/PhysRevLett.85.4932