Competing spin fluctuations and trace o vortex dynamics in the two-dimensional triangular-lattice antiferromagnet AgCrS2
Competing spin fluctuations and trace o vortex dynamics in the two-dimensional triangular-lattice antiferromagnet AgCrS2
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二维三角晶格反铁磁体 AgCrS2 中自旋竞争涨落和涡动力学轨迹
DOI：
10.1088/1361-648x/aac622
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Zhang Yuheng
中科院分区：
文献类型：
--
作者：
Gao Wenshuai;Shi Liran;Ouyang Zhongwen;Xia Zhengcai;Wang Zhe;Liu Bingjie;Li Hexuan;Zou Youming;Yu Lu;Zhang Lei;Pi Li;Qu Zhe;Zhang Yuheng
用电子自旋共振（ESR）谱研究了二维三角晶格反铁磁体AgCrS 2的自旋动力学.发现g因子表现出一种不寻常的非单调的温度依赖行为，这与ESR强度数据中观察到的超居里行为一起沿着，为温度远高于TN时铁磁和反铁磁涨落之间的竞争提供了明确的证据。当从上面接近Néel温度TN时，发现线宽发散。这种发散行为可以用Kawamura-Miyashita模型很好地描述，这是由于Z2型磁涡旋-反涡旋配对，这与二维海森堡磁系统的预期是一致的。
The spin dynamics of the two-dimensional triangular-lattice antiferromagnet AgCrS 2 is investigated by electron spin resonance (ESR) spectroscopy. The g-factor is found to show an unusual non-monotonously temperature dependent behavior, which, along with the super-Curie behavior observed in the ESR intensity data, provides clear evidence for the competition between ferromagnetic and antiferromagnetic fluctuations at temperatures well above T N. On approaching the Néel temperature T N from above, the linewidth is found to diverge. Such a divergent behavior could be well described by the Kawamura–Miyashita model due to Z2 type magnetic vortex–antivortex pairing, which is consistent with the expectation for a 2D Heisenberg magnetic system.