Kavli Affiliate: Darrell G. Schlom
| First 5 Authors: L. Y. Shi, Zhenisbek Tagay, Jiahao Liang, Khoan Duong, Yi Wu
| Summary:
We present time-domain THz spectroscopy of thin films of the heavy-fermion
superconductor CeCoIn$_5$. Below the $approx$ 40 K Kondo coherence
temperature, a narrow Drude-like peak forms, as the result of the $f$ orbital –
conduction electron hybridization and the formation of the heavy-fermion state.
The complex optical conductivity is analyzed through a Drude model and extended
Drude model analysis. Via the extended Drude model analysis, we measure the
frequency-dependent scattering rate ($1/ tau $) and effective mass
($m^*/m_b$). This scattering rate shows a linear dependence on temperature,
which matches the dependence of the resistivity as expected. Nevertheless, the
width of the low-frequency Drude peak itself that is set by the {it
renormalized} quasiparticle scattering rate ($1 / tau^* = m_b/ m^* tau $)
shows a $T^2$ dependence. This is the scattering rate that characterizes the
relaxation time of the renormalized quasiparticles. This gives evidence for
Fermi liquid state, which in conventional transport experiments is hidden by
the strong temperature dependent mass.
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