论文标题
野外诱导的反铁磁性和tomonaga-luttinger液体行为在准二维ISINIDINID-ISINID-ANTIFERROMAGNET SRCO2V2O8中
Field-induced antiferromagnetism and Tomonaga-Luttinger liquid behavior in the quasi-one-dimensional Ising-Antiferromagnet SrCo2V2O8
论文作者
论文摘要
我们研究了类似Ising的螺钉链抗Fiferromagnet Srco $ _2 $ v $ _2 $ o $ $ _8 $在纵向磁场下通过敏感性和$^{51} $ v NMR测量值的低温特性。批量敏感性$χ$显示出长距离的ISING-ANTIFERROMAGNETIC（AFM）顺序的发作，当场从0.1〜t增加到4〜t时，Néel温度从5.1〜k下降到2〜k，抑制订单。 NMR光谱和旋转晶格放松$ 1/t_1 $也观察到了田地对AFM顺序的抑制。在高于4〜T的字段，$χ$显示出低温的上流，这与量子蒙特卡洛模拟支持的横向抗铁磁序的发作一致。在高温下还观察到了NMR光谱中的线分裂。我们表明，该线的拆分表征了沿晶体[110]/[1 $ \ bar1 $ 0]方向的磁矩方向的短距离横向抗铁磁顺序的开始。 $ 1/t_1 $在较高温度下的数据显示了幂律行为$ 1/t_1 {\ sim} t^α$，这与tomonaga-luttinger-liquid行为一致。随着场地的增加，幂律指数$α$从负面变为正变为正变为正面，这清楚地表明了Luttinger指数$η$的反转，其中主要的低能量自旋波动从纵向类型转换为7〜t的高场处的横向类型。
We investigate the low-temperature properties of the Ising-like screw chain antiferromagnet SrCo$_2$V$_2$O$_8$ under a longitudinal magnetic field by susceptibility and $^{51}$V NMR measurements. The bulk susceptibility $χ$ shows an onset of long-range Ising-antiferromagnetic (AFM) order and the suppression of the order by field with the Néel temperature dropped from 5.1~K to 2~K when field increases from 0.1~T to 4~T. The suppression of the AFM order by the field is also observed by the NMR spectra and the spin-lattice relaxation $1/T_1$. At fields above 4~T, $χ$ shows a low-temperature upturn, which is consistent with the onset of a transverse antiferromagnetic order as supported by the quantum Monte Carlo simulations. A line splitting in the NMR spectra is also observed at high temperatures. We show that the line split characterizes the onset of a short-range transverse antiferromagnetic order with magnetic moments orientated along the crystalline [110]/[1$\bar1$0] directions. The $1/T_1$ data at higher temperature show a power-law behavior $1/T_1{\sim}T^α$, which is consistent with the Tomonaga-Luttinger-liquid behavior. With increasing the field, the power-law exponent $α$ changes from negative to positive, which clearly shows an inversion of the Luttinger exponent $η$, where the dominant low-energy spin fluctuations switch from the longitudinal type to the transverse type at a high field of 7~T.
