论文标题
了解量子自旋液体化合物1T-TAS2的磁反应
Understanding the magnetic response of the Quantum spin liquid compound 1T-TaS2
论文作者
论文摘要
1T tantalum二硫化物（1T-TAS2）是一种有前途的材料，可以实现量子自旋液态和分数激发。在这里，我们仔细研究了1T-TAS2在低磁场上的温度相关磁化率，以了解该系统中局部磁矩的形成及其作为温度和场的响应。我们发现，即使在几乎相应的电荷密度波（CDW）相中，易感性也随温度降低而增加，该相位表现出金属电导率，因此有望表现出独立的Pauli Parparagnetic敏感性。因此，这表明局部力矩开始在几乎相称的CDW相本身中形成，该阶段本身远高于在电阻率测量中发现莫特绝缘状态的证据的温度。在相称的CDW阶段，易感性的温度依赖性显着偏离居里 - 韦斯定律，并且在二维三维三角晶格上没有显示S = 1/2旋转所期望的磁性。低于t = 10 k，易感性遵循了对温度的功率定律的依赖性，这表明在1T-TAS2中形成随机单线状态。
1T-tantalum disulphide (1T-TaS2) is a promising material to realize quantum spin liquid state and fractional excitations. Here, we take a closer look on the temperature dependent magnetic susceptibility of 1T-TaS2 at low magnetic fields to understand the formation of local magnetic moment in this system and its response as a function of temperature and field. We found that the susceptibility increases with reduction in the temperature even in the nearly commensurate charge density wave (CDW) phase, which exhibits metallic conductivity and hence is expected to exhibit temperature independent Pauli paramagnetic susceptibility. Therefore, it indicates that local moment starts forming in the nearly commensurate CDW phase itself, which is well above the temperature where the evidence of Mott insulating state is found in resistivity measurement. In the commensurate CDW phase, temperature dependence of susceptibility significantly deviates from the Curie-Weiss law and does not show the magnetic properties expected from S = 1/2 spin on a two dimensional triangular lattice. Below T = 10 K, susceptibility follows a power law dependence on the temperature, which indicates towards the formation of random singlet state in 1T-TaS2.
