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
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.
Project supported by the National Basic Research Program of China (Grant Nos. 2012CB821400, 2012CB921302, and 2015CB921303) and the National Natural Science Foundation of China (Grants Nos. 11274237, 91121004, 51228201, and 11004238). Wei Zhang also thanks the support of the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
Wei Zhang(张威), Bing Xu(许兵), Run Yang(杨润), Jin-Yun Liu(刘金云), Hao Yang(杨浩), Xiang-Gang Qiu(邱祥冈) Optical study of charge dynamics in CaCo2As2 2016 Chin. Phys. B 25 057201
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