{"title":"范德华反铁磁体 FeGa2S4 中不寻常的自旋动力学。","authors":"Yifei Tang, Yoshihiko Umemoto, Yo Kawamoto, Masahiro Kawamata, Shinichiro Asai, Yoichi Ikeda, Masaki Fujita, Yusuke Nambu","doi":"10.1088/1361-648X/ad861a","DOIUrl":null,"url":null,"abstract":"<p><p>Spin dynamics in the van der Waals antiferromagnet FeGa<sub>2</sub>S<sub>4</sub>with 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, FeGa<sub>2</sub>S<sub>4</sub>can be a playground for studying temporal spin correlations in the two-dimensional limit.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.3000,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Unusual spin dynamics in the van der Waals antiferromagnet FeGa<sub>2</sub>S<sub>4</sub>.\",\"authors\":\"Yifei Tang, Yoshihiko Umemoto, Yo Kawamoto, Masahiro Kawamata, Shinichiro Asai, Yoichi Ikeda, Masaki Fujita, Yusuke Nambu\",\"doi\":\"10.1088/1361-648X/ad861a\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Spin dynamics in the van der Waals antiferromagnet FeGa<sub>2</sub>S<sub>4</sub>with 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, FeGa<sub>2</sub>S<sub>4</sub>can be a playground for studying temporal spin correlations in the two-dimensional limit.</p>\",\"PeriodicalId\":16776,\"journal\":{\"name\":\"Journal of Physics: Condensed Matter\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.3000,\"publicationDate\":\"2024-10-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Physics: Condensed Matter\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1088/1361-648X/ad861a\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"PHYSICS, CONDENSED MATTER\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Physics: Condensed Matter","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1088/1361-648X/ad861a","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
引用次数: 0
摘要
通过磁力测量、中子散射和μ介子自旋弛豫测量,研究了具有三角形晶格的范德华反铁磁体 FeGa2S4 中的自旋动力学。自旋弛豫时间的特征在 13 个数量级上得到了彻底澄清。虽然直流和交流电感的温度依赖性让人联想到传统的自旋玻璃转变,但非线性电感在反常温度 T* = 16.87(7) K 时没有出现分歧,这否认了这一点,反而暗示了其他机制。弹性中子散射和先前测量到的μ介子结果描绘了一个高于T*的缓慢波动(约10-5秒)的自旋态。FeGa2S4将受挫磁体中最简单的底层结构与错综复杂的时间尺度层次并列在一起,可以成为研究二维极限中时间自旋相关性的乐园。
Unusual spin dynamics in the van der Waals antiferromagnet FeGa2S4.
Spin dynamics in the van der Waals antiferromagnet FeGa2S4with 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, FeGa2S4can be a playground for studying temporal spin correlations in the two-dimensional limit.
期刊介绍:
Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.