Optical study of charge dynamics in CaCo_2As_2  

作　　者：张威 许兵 杨润 刘金云 杨浩 邱祥冈 

机构地区：[1]College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow university [2]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences [3]College of Science, Nanjing University of Aeronautics and Astronautics

出　　处：《Chinese Physics B》2016年第5期1-4,共4页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China (Grant Nos. 2012CB821400, 2012CB921302, and 2015CB921303);the National Natural Science Foundation of China (Grants Nos. 11274237, 91121004, 51228201, and 11004238);the support of the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

摘　　要：We present an infrared spectroscopy study of charge dynamics in CaCo_2As_2 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 T^2 behavior in the dc resistivity ρ_n and scattering rate 1/τ_n, indicating a coherent nature of quasiparticles in the narrow Drude subsystem.We present an infrared spectroscopy study of charge dynamics in CaCo_2As_2 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 T^2 behavior in the dc resistivity ρ_n and scattering rate 1/τ_n, indicating a coherent nature of quasiparticles in the narrow Drude subsystem.

关 键 词：infrared spectroscopy optical conductivity Fermi liquid 

分 类 号：O611.3[理学—无机化学]