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Dimensional crossover in self-intercalated antiferromagneticV5S8nanoflakes
Physical Review B ( IF 3.2 ) Pub Date : 2022-06-24 , DOI: 10.1103/physrevb.105.235433
Zhang Zhou , Xiaoxu Zhao , Liangmei Wu , Hongtao Liu , Jiancui Chen , Chuanyin Xi , Zhaosheng Wang , Enke Liu , Wu Zhou , Stephen J. Pennycook , Sokrates T. Pantelides , Xiao-Guang Zhang , Lihong Bao , Hong-Jun Gao

Electronic and magnetic ordered states are strongly correlated to the dimensions of matter. Here we report a dimensional crossover in self-intercalated antiferromagnetic V5S8 nanoflakes. The transition of three-dimensional (3D) to two-dimensional (2D) transport, evidenced by thickness-independent conductivity, occurs when the thickness of V5S8 flakes is reduced to ∼7.3 nm. At low temperatures, 3D transport follows Fermi liquid behavior, but 2D transport suggests the emergence of Kondo physics with a logarithmic dependence on the temperature and a negative magnetoresistance of a 5.0 nm thick V5S8 flake at low temperatures for both in-plane and perpendicular magnetic fields. At temperatures higher than 6 K, the magnetoresistance is positive and parabolically dependent on the magnetic field, indicating suppression of the antiferromagnetic order. Based on a simple magnon gas model, a temperature-independent effective magnon moment (1gμB) is extracted from the Hall coefficient for all V5S8 flakes with different thicknesses. Our results reveal that dimensional crossover plays an important role in tuning the electronic properties in 2D metallic transition-metal dichalcogenides (TMDs).

中文翻译:

自插层反铁磁V5S8纳米薄片中的维数交叉

电子和磁性有序状态与物质的维度密切相关。在这里,我们报告了自插层反铁磁中的维度交叉5小号8纳米薄片。由与厚度无关的电导率证明的三维(3D)到二维(2D)传输的转变发生在当厚度5小号8薄片减少到~7.3 nm。在低温下,3D 输运遵循费米液体行为,但 2D 输运表明近藤物理学的出现具有对温度的对数依赖性和 5.0 nm 厚的负磁阻5小号8对于平面内和垂直磁场,在低温下会产生薄片。在高于 6 K 的温度下,磁阻为正且呈抛物线依赖于磁场,表明反铁磁顺序受到抑制。基于一个简单的磁振子气体模型,一个与温度无关的有效磁振矩(1Gμ)从霍尔系数中提取所有5小号8不同厚度的薄片。我们的研究结果表明,维度交叉在调整二维金属过渡金属二硫化物 (TMD) 的电子特性方面起着重要作用。
更新日期:2022-06-24
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