Aug 20, 2002
Correlated Electron Dynamics in SrRuO3
Dr. Steve Dodge, Simon Fraser University, Canada
The conductivity of SrRuO_3 exhibits an anomalous power-law frequency
dependence, much like the optimally doped cuprates. In contrast to high
temperature superconductors, however, SrRuO_3 is a ferromagnetic metal, so its
normal-state quasiparticle dynamics can be examined at low temperatures and
frequencies, where Fermi liquid theory is expected to be most reliable. Using a
combination of time-domain terahertz and infrared spectroscopies, we have found
that the conductivity of our thin film samples follows a remarkably simple form
that deviates sharply from Fermi liquid theory. However, subsequent dc transport
measurements, on single crystal samples and at millikelvin temperatures, recover
Fermi liquid phenomenology. This suggests that the Fermi liquid regime of this
material is quite restricted, and sensitive to disorder, while a separate
phenomenology governs the regime covered in our measurements.
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