Field-induced antiferromagnetism and Tomonaga-Luttinger liquid behavior in the quasi-one-dimensional Ising antiferromagnet
Field-induced antiferromagnetism and Tomonaga-Luttinger liquid behavior in the quasi-one-dimensional Ising antiferromagnet
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准一维伊辛反铁磁体中场致反铁磁性和 Tomonaga-Luttinger 液体行为
DOI：
10.1103/physrevb.105.174428
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发表时间：
2022
影响因子：
3.7
通讯作者：
Rong Yu
中科院分区：
文献类型：
--
作者：
Yi Cui;Yuchen Fan;Z. Hu;Zhangzhen He;Weiqiang Yu;Rong Yu
本文通过磁化率和$^{51}$V核磁共振测量研究了纵向磁场作用下类伊辛螺旋链反铁磁体SrCo $_2$V$_2$O$_8 $的低温性质。体磁化率表明，当磁场从0.1 T增加到4 T时，随着N '{e}el温度从5.1 K下降到2 K，出现了长程Ising反铁磁（AFM）有序，并且这种有序受到磁场的抑制.通过NMR谱和自旋-晶格弛豫$1/T_1$也观察到了磁场对AFM有序度的抑制。在4~T以上的磁场中，$chi$显示出低温的上升，这与量子蒙特卡罗模拟所支持的横向反铁磁序的开始是一致的。在高温下也观察到了谱线分裂。我们表明，谱线分裂表征了短程横向反铁磁有序的开始，磁矩沿着晶体[110/[1$bar 1$0]方向取向。在较高温度下的$1/T_1$数据显示幂律行为$1/T_1{sim}T^{alpha}$，这与Tomonaga-Luttinger-liquid行为一致。随着外场的增加，幂律指数α由负变正，这清楚地表明了Luttinger指数η的反转，在7 T的高场下，主导的低能自旋涨落从纵向型转变为横向型.
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 $chi$ shows an onset of long-range Ising-antiferromagnetic (AFM) order and the suppression of the order by field with the N'{e}el 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, $chi$ 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 $1/T_1{sim}T^{alpha}$, which is consistent with the Tomonaga-Luttinger-liquid behavior. With increasing the field, the power-law exponent $alpha$ changes from negative to positive, which clearly shows an inversion of the Luttinger exponent $eta$, where the dominant low-energy spin fluctuations switch from the longitudinal type to the transverse type at a high field of 7~T.