Tang Yifei, Umemoto Yoshihiko, Kawamoto Yo, Kawamata Masahiro, Asai Shinichiro, Ikeda Yoichi, Fujita Masaki, Nambu Yusuke
Department of Physics, Tohoku University, Sendai 980-8578, Japan.
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
J Phys Condens Matter. 2024 Oct 28;37(3). doi: 10.1088/1361-648X/ad861a.
Spin dynamics in the van der Waals antiferromagnet FeGaSwith triangular lattices are investigated using magnetometry, neutron scattering, and muon spin relaxation measurements. The characteristic spin relaxation time is thoroughly clarified over thirteen orders of magnitude. Although the temperature dependence of DC and AC susceptibilities recalls a conventional spin-glass transition, nonlinear susceptibilities showing no divergences at the anomalous temperature,T∗=16.87(7) K, deny that and instead hint at other mechanisms. Elastic neutron scattering together with previously measured muon results depict a slowly fluctuated (∼10-5 s) spin state aboveT∗. In juxtaposing the underlying simplest structure among frustrated magnets with an intricate hierarchy of time scales, FeGaScan be a playground for studying temporal spin correlations in the two-dimensional limit.
利用磁力测量、中子散射和μ子自旋弛豫测量研究了具有三角晶格的范德华反铁磁体FeGaS中的自旋动力学。在超过十三个数量级的范围内彻底阐明了特征自旋弛豫时间。尽管直流和交流磁化率的温度依赖性让人联想到传统的自旋玻璃转变，但非线性磁化率在异常温度T∗ = 16.87(7) K时没有发散，这否定了这种转变，反而暗示了其他机制。弹性中子散射与先前测量的μ子结果一起描绘了高于T∗的缓慢波动（~10 - 5 s）自旋态。将受挫磁体中潜在的最简单结构与复杂的时间尺度层次并列，FeGaS可以成为研究二维极限下时间自旋相关性的一个平台。
