Optical study of charge dynamics in CaCo_2As_2 |
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| Institution: | 1. College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow university, Suzhou 215006, China;
2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China |
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| Abstract: | We present an infrared spectroscopy study of charge dynamics in CaCo2As2 single crystal. In this material, the optical conductivity can be described by two Drude components with different scattering rates (1/τ): a broad incoherent background and a narrow Drude component. By monitoring the temperature dependence, we find that only the narrow Drude component is temperature-dependent and determines the transport properties. Especially a Fermi liquid behavior of carriers is revealed by the T2 behavior in the dc resistivity ρn and scattering rate 1/τn, indicating a coherent nature of quasiparticles in the narrow Drude subsystem. |
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| Keywords: | infrared spectroscopy optical conductivity Fermi liquid |
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