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Non-Fermi-liquid behavior of the organic superconductor κ-(BEDT-TTF)4Hg2.89Br8 probed by 13C NMR

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タイトル: Non-Fermi-liquid behavior of the organic superconductor κ-(BEDT-TTF)4Hg2.89Br8 probed by 13C NMR
著者: Eto, Yoshihiro 著作を一覧する
Itaya, Megumi 著作を一覧する
Kawamoto, Atsushi 著作を一覧する
発行日: 2010年 6月21日
出版者: American Physical Society
誌名: Physical Review B
巻: 81
号: 21
開始ページ: 212503
出版社 DOI: 10.1103/PhysRevB.81.212503
抄録: An organic salt, κ-(BEDT-TTF)4Hg2.89Br8 exhibits superconductivity at 4.3 K under ambient pressure suggesting non-Fermi-liquid (NFL) behavior just above Tc. Whereas most organic superconductors are controlled by the bandwidth in the half-filled electron system, this salt realizes a carrier doping away from the half-filled electron system as well as high-Tc cuprates. In order to investigate the origin of NFL behavior, we assessed 13C-NMR measurements in this salt and observed the antiferromagnetic fluctuation as same as in an organic antiferromagnet κ-(BEDT-TTF)2Cu[N(CN)2]Cl with the gap structure. Application of pressure suppresses (T1T)^[-1] and shifts its maximum to lower temperatures with (T1T)^[-1] becoming constant above 2 GPa. These results suggest that applying pressure alters the electron system from NFL to FL state and that antiferromagnetic fluctuations contribute to the origin of NFL behavior.
Rights: ©2010 The American Physical Society
資料タイプ: article
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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