Local Spin Susceptibility Characteristic of Zero-Gap State of $\alpha$-(BEDT-TTF)2I3 under Pressure
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概要
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We performed 13C-NMR measurements in the metallic state of $\alpha$-(BEDT-TTF)2I3 under pressure to determine the local spin susceptibility at each BEDT-TTF molecular site. We found that the local susceptibility becomes quite different from molecule to molecule in a unit cell with approach to the zero-gap state (ZGS) under pressure. This is related to the charge disproportionation among molecular sites [named A (A$'$), B, and C]. We confirmed that the most/least positively charged site, the B/C molecule, carries the smallest/largest local susceptibility. We also confirmed the linear temperature dependence of the local susceptibility at low temperatures. These results are consistent with the theoretical calculation [Eur. Phys. J. B 67 (2009) 139] and should be considered as the characteristics of the ZGS.
- 2010-10-15
著者
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Hiraki Ko-ichi
Department Of Physics Gakushuin University
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Takano Yoshiki
Department Of Electrical Engineering Waseda University
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Takahashi Toshihiro
Department Of Applied Biology Kyoto Institute Of Technology
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Yamamoto Hiroshi
Riken
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Takano Yoshiki
Department of Physics, Gakushuin University, 1-5-1 Mejiro, Toshima, Tokyo 171-8588
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Takada Yusuke
Department of Physics, Gakushuin University, 1-5-1 Mejiro, Toshima, Tokyo 171-8588
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Takahashi Toshihiro
Department of Physics, Gakushuin University, 1-5-1 Mejiro, Toshima, Tokyo 171-8588
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TAKAHASHI Toshihiro
Department of Animal Science, Faculty of Agriculture, Tohoku University
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