Observation of Spin and Charge ordering in Quasi 1-D organic superconductor under high pressure

高压下准一维有机超导体自旋和电荷有序性的观察

• 批准号: 21740263
• 负责人: ITOI Miho
• 金额: $ 2.33万
• 依托单位: Nihon University (2010)Aoyama Gakuin University (2009)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740263/
• 关键词: 擬一次元系; 有機導体; TMTTF; 超伝導; 高圧力下測定; 擬一次元有機導体; 圧力下磁化率測定; 反強磁性; 分子性固体

Quasi 1 D organic conductor (TMTTF)_2SbF_6 exhibits a charge ordering (T_<CO>=154K) and antiferromagnetic transition (AF: T_N=8K) at ambient pressure. Recently, superconducting (SC) phase was observed at Tc = 2.8 K under ～6 GPa, and a newly improved temperature-pressure (T-P) phase diagram was proposed based on the resistivity under high pressure. The expected phase change is AF(I) -sP (spin Peierls) or spin gap (SG) -AF(II). To investigate the spin state up to 1 GPa at low temperatures, the magnetic susceptibility measurement has been carried out with CuBe pressure clamp cell designed for organic materials. We have clearly observed AF phase was suppressed with applying external pressures and it disappeared at 0.6 GPa.

准一维有机导体（TMTTF）_2SbF_6在常压下具有电荷有序（T_N <CO>= 154 K）和反铁磁相变（AF：T_N= 8 K）。最近，在~6 GPa下，在Tc = 2.8K处观察到了超导相，并根据高压下的电阻率提出了一种新的改进的温度-压力（T-P）相图。预期的相变是AF（I）-sP（自旋Peierls）或自旋间隙（SG）-AF（II）。为了研究低温下1GPa以下的自旋态，用专门为有机材料设计的CuBe压钳盒测量了磁化率。我们已经清楚地观察到AF相被施加外部压力抑制，并且在0.6GPa时消失。

项目成果

Completely hydrostatic pressure effect of anisotropic resistivity in the 1-D organic conductor (TMTTF)_2SbF_6

一维有机导体(TMTTF)_2SbF_6中各向异性电阻率的完全静水压力效应

• DOI: 10.1016/j.physc.2009.11.138
• 发表时间: 2010
• 期刊: Physica
• 作者: M. Itoi;Y. Ishii;S. Takekoshi; H. Kitano;K. Matsubayashi;Y. Uwatoko;T. Nakamura
• 通讯作者: T. Nakamura