Terahertz Conductivity of the Heavy-Fermion State in CeCoIn
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概要
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The optical properties of thin films of the heavy-fermion compound CeCoIn<inf>5</inf>, which were deposited by molecular beam epitaxy onto MgF<inf>2</inf>substrates, have been studied at frequencies 7 to 45 cm<sup>-1</sup>(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.
- 2013-04-15
著者
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Shishido Hiroaki
Department Of Orthopaedic Surgery Fukushima Medical University School Of Medicine
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Shibauchi Takasada
Department Of Applied Physics University Of Tokyo
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Matsuda Yuji
Department Of Applied Molecular Bioscience Graduate School Of Bioagricultural Sciences Nagoya University
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Terashima Takahito
Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8502, Japan
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Mizukami Yuta
Department of Physics, Kyoto University, Kyoto 606-8502, Japan
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Scheffler Marc
Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany
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Weig Thomas
Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany
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Dressel Martin
Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany
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Weig Thomas
Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany
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Shibauchi Takasada
Department of Physics, Kyoto University, Kyoto 606-8502, Japan
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Terashima Takahito
Research Center for Low Temperature and Materials Science, Kyoto University, Kyoto 606-8502, Japan
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Shishido Hiroaki
Department of Physics, Kyoto University, Kyoto 606-8502, Japan
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