Abstract
We studied two BaFe2−xNixAs2 (Ni-doped Ba-122) single crystals at two different doping levels (underdoped and optimally doped) using an optical spectroscopic technique. The underdoped sample shows a magnetic phase transition around 80 K. We analyze the data with a Drude-Lorentz model with two Drude components (D1 and D2). It is known that the narrow D1 component originates from electron carriers in the electron-pockets and the broad D2 mode is from hole carriers in the hole-pockets. While the plasma frequencies of both Drude components and the static scattering rate of the broad D2 component show negligible temperature dependencies, the static scattering rate of the D1 mode shows strong temperature dependence for the both samples. We observed a hidden quasi-linear temperature dependence in the scattering rate of the D1 mode above and below the magnetic transition temperature while in the optimally doped sample the scattering rate shows a more quadratic temperature dependence. The hidden non-Fermi liquid behavior in the underdoped sample seems to be related to the magnetic phase of the material.
Highlights
Show significantly different temperature-dependent trends; only one of the Drude modes shows a strong temperature dependence
In the earlier paper they introduced a so-called one-component analysis, which is known as an extended Drude model[10,11]
The non-monotonic behavior with temperature seems to be related to the magnetic phase transition of the system
Summary
Show significantly different temperature-dependent trends; only one of the Drude modes shows a strong temperature dependence. To resolve the multiband issue one should develop a new method including the multiband nature Another issue for the direct application of the extended Drude model to the Fe-pictides is that the system has low-energy interband transitions[15], which need to be considered. Because of those nontrivial issues associated with application of the one-component analysis we applied a two-component analysis to analyze our optically measured spectra. Other studies show that D1 (D2) come from the contribution of the electron-pocket (hole-pocket)[8,16,17] From this analysis we can expose hidden transport properties. We observed that the underdoped and optimally doped samples show different temperature dependent hidden transport properties; the optimally doped sample shows a Fermi-liquid behavior while the underdoped one shows a non-Fermi liquid behavior
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