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J. Phys. Soc. Jpn. 82, 043712 (2013) [5 Pages]
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LETTERS

Terahertz Conductivity of the Heavy-Fermion State in CeCoIn5

Marc Scheffler1, Thomas Weig1, Martin Dressel1, Hiroaki Shishido2, Yuta Mizukami2, Takahito Terashima3, Takasada Shibauchi2, and Yuji Matsuda2
+ Affiliations
1Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany2Department of Physics, Kyoto University, Kyoto 606-8502, Japan3Research Center for Low Temperature and Materials Science, Kyoto University, Kyoto 606-8502, Japan
Received January 31, 2013; Accepted March 1, 2013; Published March 29, 2013

The optical properties of thin films of the heavy-fermion compound CeCoIn5, which were deposited by molecular beam epitaxy onto MgF2 substrates, have been studied at frequencies 7 to 45 cm-1 (corresponding to 0.2 to 1.3 THz) and temperatures 2 to 300 K. We observe an electrodynamic behavior which is typical for heavy fermions, namely Drude-like conductivity with a relaxation rate at rather low frequencies. This relaxation rate increases almost linearly with temperature up to at least 30 K. The coherent heavy-fermion state, characterized by an increase of the effective mass, continuously evolves upon cooling and is not fully developed for temperatures as low as 5 K.

©2013 The Physical Society of Japan
https://doi.org/10.7566/JPSJ.82.043712
KEYWORDS: CeCoIn\(_{5}\) , THz conductivity, optical conductivity, heavy fermion, thin film

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