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- W2976278160 abstract "Due to the simplest crystalline structure among Fe-based superconductors, the FeSe system has attracted a lot of attention. In this work, FeSe thin films grown on the CaF2 substrate with Tc0 = 6 and 11 K (named FeSe_1 and FeSe_2, respectively) are fabricated by a pulsed laser deposition technique. X-ray diffraction exhibits a high-quality single crystal of the two FeSe samples, and the lattice constants are about 5.574 Å. Atomic force microscopy characterizes their surface topography and roughness, which shows stripes in their surfaces that is helpful to construct a roughness layer using the optical measurement spectroscopic ellipsometry (SE) technique. SE is a powerful tool to determine FeSe thin films’ complex refractive index N=n+ik and plasma oscillation frequency ωp. These important parameters are related to scattering rate τ−1 for FeSe thin films. The results show that scattering rate τ−1 of FeSe_2 is significantly lower than that of FeSe_1 in the whole frequency testing range at room temperature, which may be the reason that FeSe_2 owns higher Tc0 in low temperature than FeSe_1." @default.
- W2976278160 created "2019-10-03" @default.
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- W2976278160 date "2019-09-01" @default.
- W2976278160 modified "2023-10-17" @default.
- W2976278160 title "Obtaining the scattering rate of different <i>T</i><sub>c0</sub> FeSe thin films via spectroscopic ellipsometry" @default.
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- W2976278160 doi "https://doi.org/10.1116/1.5119394" @default.
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