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。

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.