Optical study of charge dynamics in CaCo_2As_2

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 temperatu...

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Bibliographic Details
Published in中国物理B：英文版 no. 5; pp. 1 - 4
Main Author 张威 许兵 杨润 刘金云 杨浩 邱祥冈
Format Journal Article
LanguageEnglish
Published 2016
Subjects
光学
散射率
温度依赖性
电荷变化
监测温度
费米液体
输运性质
非相干
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Summary: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.
Bibliography:Wei Zhang, Bing Xu, Run Yang Jin-Yun Liu, Hao Yang, and Xiang-Gang Qiu（ 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, Beifing lO0190, China 3 College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China）
11-5639/O4
infrared spectroscopy; optical conductivity; Fermi liquid
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.
ISSN:1674-1056
2058-3834