2002-7

擬一次元有機導体(TMTTF)₂Brにおけるスピン密度波転移
SDW Transitions in Q1D Organic Conductor (TMTTF)₂Br

(TMTTF)₂BrのSDW相における輸送現象を圧力，磁場下において測定した．SDW転移温度の磁場依存性から，(TMTTF)₂Brの電子相関と二次元性の強さの圧力下依存性を求め、圧力による電子相関の結合定数N(0)Iの減少を考慮した平均場理論によってSDW転移の磁場－圧力依存性がよく説明できることを明らかにした．

北海道大学大学院　理学研究科：松永悟明、野村一成
東北大学　金属材料研究所：佐々木孝彦
分子科学研究所：中村敏和

The SDW phase in (TMTTF)₂Br was investigated through transport measurements under pressure and magnetic fields. From the field dependence of T_SDW, we determined the role of electron correlation and two dimensionality in the SDW phase of (TMTTF)₂Br under pressure and found that the SDW transition can be well explained within the mean field theory by taking into account the reduction of the coupling constant N(0)I by pressure.

Division of Physics, Hokkaido University: N. Matsunaga, K. Nomura
IMR, Tohoku University: T. Sasaki
Institute for Molecular Science: T. Nakamura
Reference: A. Ishikawa, N. Matsunaga, K. Nomura, et. al.,
"Electron correlation and two-dimensionality in the spin-density-wave phase of (TMTTF)₂Br under pressure", Physical Review B 67 (2003) 212404.