Charge carrier dynamics of the heavy-fermion metal CeCoIn5 probed by THz spectroscopy

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:400

Article; Proceedings Paper

Pracht, Uwe S.¹  Simmendinger, Julian¹  Dressel, Martin¹  Endo, Ryota²  Watashige, Tatsuya²  Hanaoka, Yousuke²  Shimozawa, Masaaki²  Terashima, Takahito³  Shibauchi, Takasada⁴  Matsuda, Yuji²  Scheffler, Marc¹ 

[1] Univ Stuttgart, Inst Phys 1, D-70569 Stuttgart, Germany

[2] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[3] Kyoto Univ, Res Ctr Low Temp & Mat Sci, Kyoto 6068502, Japan

[4] Univ Tokyo, Dept Adv Mat Sci, Chiba 2778561, Japan

关键词: CeCoIn5;    Heavy fermions;    Drude model;    Charge carrier dynamics;    THz spectroscopy;   

DOI  :  10.1016/j.jmmm.2015.08.117

来源: Elsevier

【 摘 要 】

We discuss the charge carrier dynamics of the heavy-fermion compound CeCoIn5 in the metallic regime measured by means of quasi-optical THz spectroscopy. The transmittance of electromagnetic radiation through a CeCoIn5 thin film on a dielectric substrate is analyzed in the single-particle Drude framework. We discuss the temperature dependence of the electronic properties, such as the scattering time and dc-conductivity and compare with transport measurements of the sheet resistance. Towards low temperatures, we find an increasing mismatch between the results from transport and Drude-analyzed optical measurements and a growing incapability of the simple single-particle picture describing the charge dynamics, likely caused by the evolving heavy-fermion nature of the correlated electron system. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free