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Non-Fermi liquid behavior of SrRuO_3 -- evidence from infrared conductivity

P. Kostic·Y. Okada·Z. Schlesinger·J. W. Reiner·L. Klein·A. Kapitulnik·T. H. Geballe·M. R. Beasley
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Abstract

The reflectivity of the itinerant ferromagnet SrRuO_3 has been measured between 50 and 25,000 cm-1 at temperatures ranging from 40 to 300 K, and used to obtain conductivity, scattering rate, and effective mass as a function of frequency and temperature. We find that at low temperatures the conductivity falls unusually slowly as a function of frequency (proportional to ω^{-1/2}), and at high temperatures it even appears to increase as a function of frequency in the far-infrared limit. The data suggest that the charge dynamics of SrRuO_3 are substantially different from those of Fermi-liquid metals.

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P. Kostic, Y. Okada, Z. Schlesinger, J. W. Reiner, L. Klein, A. Kapitulnik, T. H. Geballe, M. R. Beasley. 1998-04-03. Non-Fermi liquid behavior of SrRuO_3 -- evidence from infrared conductivity. https://doi.org/10.1103/physrevlett.81.2498

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