Temperature Dependence of Inter-Layer Longitudinal Magnetoresistance in $\alpha$-(BEDT-TTF)2I3: Positive versus Negative Contributions in a Tilted Dirac Cone System
スポンサーリンク
概要
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Temperature depedence of the longitudinal interlayer magnetoresistance (MR) of a bulk Dirac cone system, $\alpha$-(BEDT-TTF)2I3, is examined. It exhibits a peak related to the crossover from the quantum limit regime with negative MR at low temperatures to the inter-level scattering regime with positive MR at higher temperatures. The field dependence of the MR peak temperature, which measures the energy separation between the $n = 0$ and $\pm 1$ Landau levels, evidences that the peculiar Landau quantization of the Dirac cone dispersion is relevant to both effects. The effective Fermi velocity, $v_{\text{eff}}$, which reflects the width and spacing of the Landau levels, has been estimated from the analysis taking account of the Zeeman-split Landau levels.
- 2010-11-15
著者
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Nishio Yutaka
Department Of Chemistry Faculty Of Science Toho University
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Kato Reizo
Riken
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Kajita Koji
Department Of Physics Faculty Of Science Toho University
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Tamura Masafumi
Department Of Chemistry Faculty Of Science The University Of Tokyo
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Tajima Naoya
Riken
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Sugawara Shigeharu
Department Of Physics Toho University:research Center For Materials With Integrated Properties Toho
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Nishio Yutaka
Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan
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Sato Mitsuyuki
Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan
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Kato Reizo
RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan
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Sugawara Shigeharu
Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
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Tajima Naoya
RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan
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