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Local spin susceptibility in the zero-gap-semiconductor state of α-(BEDT-TTF)2I3 probed by 13C NMR under pressure

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タイトル: Local spin susceptibility in the zero-gap-semiconductor state of α-(BEDT-TTF)2I3 probed by 13C NMR under pressure
著者: Hirose, Shinji 著作を一覧する
Kawamoto, Atsushi 著作を一覧する
発行日: 2010年 9月15日
出版者: American Physical Society
誌名: Physical Review B
巻: 82
号: 11
開始ページ: 115114
出版社 DOI: 10.1103/PhysRevB.82.115114
抄録: α-(BEDT-TTF)2I3 has a double column structure with three crystallographically independent molecules, A, B, and C, and becomes an insulator below 135 K due to a charge-ordering (CO) transition. The CO state is suppressed under pressure and shows weak temperature dependence of the electrical resistance. The decline of the carrier density is observed over 1.8 GPa, suggesting a zero-gap-semiconductor state under high pressure. The local susceptibility on each site provides important information about the electronic band structure. In our previous work, molecular site B became spin poor and molecular site C became spin rich in the metallic state, suggesting the disproportionation of the local spin density. Therefore, it is worthwhile to investigate the behavior of the electron properties of each molecular site. We accessed the 13C-NMR in this salt at ambient pressure and at 2.1 GPa. The analysis of the local spin susceptibility suggests that the disproportionation of the spin susceptibility at 2.1 GPa is enhanced from that at ambient pressure, and the spin susceptibility vanishes at low temperature at 2.1 GPa. Moreover, from the temperature dependence of T^[-1]_[1], we obtain the relation of T^[-1]_[-1] ∝ T^[3.1].
Rights: ©2010 The American Physical Society
資料タイプ: article
URI: http://hdl.handle.net/2115/44004
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 河本 充司

 

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