Ultralow-Dissipative Conductivity by Dirac Fermions in BaFe
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概要
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We report on the anomalous behavior of the complex conductivity of BaFe<inf>2</inf>As<inf>2</inf>, which is considered to be related to the Dirac cone, in the terahertz (THz)-frequency region. Above the spin-density-wave (SDW) transition temperature, the conductivity spectra follow the Drude formula. In the SDW state, the imaginary part of the conductivity, \sigma_{2}, is suppressed in comparison with that expected according to the Drude model, whereas the real part, \sigma_{1}, exhibits nearly Drude-like behavior. This behavior (i.e., almost no changes in \sigma_{1} and the depression of \sigma_{2}) can be regarded as reflecting the addition of extra conductivity without any dissipations in the Drude-type conductivity. We argue that the origin of this ultralow-dissipative conductivity is found to be the contribution from quasiparticles within the Dirac cone.
- 2013-04-15
著者
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Hosono Hideo
Frontier Collaborative Research Center Tokyo Institute Of Technology
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Imai Yoshinori
Department Of Basic Science The University Of Tokyo
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Maeda Atsutaka
Department Of Applied Physics The University Of Tokyo
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Nabeshima Fuyuki
Department Of Basic Science The University Of Tokyo
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HIRAMATSU Hidenori
Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Hosono Hideo
Frontier Research Center, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Nakamura Daisuke
The Institute for Solid State Physics, the University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Katase Takayoshi
Frontier Research Center, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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