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

准一维有机导体（TMTTF）_2SbF_6在常压下表现出电荷有序（T_<CO>=154K）和反铁磁跃迁（AF: T_N=8K）。最近，在~6 GPa条件下，在Tc = 2.8 K下观察到超导（SC）相，并提出了一种基于高压电阻率的改进的温度-压力（T-P）相图。预期相变为AF(I) -sP（自旋佩尔斯）或自旋间隙(SG) -AF（II）。为了研究有机材料在低温下高达1gpa的自旋态，采用设计用于有机材料的CuBe压夹电池进行了磁化率测量。我们清楚地观察到AF相在施加外压时被抑制，在0.6 GPa时消失。

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.