Thickness-dependent magnetic order and phase transition in V<sub>5</sub>S<sub>8</sub>*

Zhang, Ruizi; Zhang, Yuyang; Du, Shixuan

doi:10.1088/1674-1056/ab8db1

Cited by 6 publications

(6 citation statements)

References 46 publications

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“…The possibility of a collective magnetic state implies FM interparticle correlations; however, we note that bulk V 3 Te 4 (or V 5 Te 8 ) is a weak itinerant AFM. , In the case of V x X y compounds, it is known that only the intercalated V atoms bear a magnetic moment, while the VX 2 layers provide conducting electrons, facilitating an AFM ordering. The recent studies reporting the suppression of the AFM state and the emergence of 2D FM in V 5 Se 8 and V 5 S 8 as the thickness is reduced to few nanometers ,, evidence that dimensionality plays an important role in the modification of the magnetic structure and properties of such layered compounds. However, the magnetic structure of the 3:4 family compounds or their thickness-dependent properties remains elusive, to the best of our knowledge.…”

Section: Results and Discussionmentioning

confidence: 99%

Collective Magnetic Behavior in Vanadium Telluride Induced by Self-Intercalation

et al. 2023

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Self-intercalation of native magnetic atoms within the van der Waals (vdW) gap of layered two-dimensional (2D) materials provides a degree of freedom to manipulate magnetism in low-dimensional systems. Among various vdW magnets, the vanadium telluride is an interesting system to explore the interlayer order−disorder transition of magnetic impurities due to its flexibility in taking nonstoichiometric compositions. In this work, we combine high-resolution scanning transmission electron microscopy (STEM) analysis with density functional theory (DFT) calculations and magnetometry measurements, to unveil the local atomic structure and magnetic behavior of V-rich V 1+x Te 2 nanoplates with embedded V 3 Te 4 nanoclusters grown by chemical vapor deposition (CVD). The segregation of V intercalations locally stabilizes the self-intercalated V 3 Te 4 magnetic phase, which possesses a distorted 1T′-like monoclinic structure. This phase transition is controlled by the electron doping from the intercalant V ions. The magnetic hysteresis loops show that the nanoplates exhibit superparamagnetism, while the temperature-dependent magnetization curves evidence a collective superspin-glass magnetic behavior of the nanoclusters at low temperature. Using four-dimensional (4D) STEM diffraction imaging, we reveal the formation of collective diffuse magnetic domain structures within the sample under the high magnetic fields inside the electron microscope. Our results shed light on the studies of dilute magnetism at the 2D limit and on strategies for the manipulation of magnetism for spintronic applications.

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Section: Results and Discussionmentioning

confidence: 99%

Collective Magnetic Behavior in Vanadium Telluride Induced by Self-Intercalation

et al. 2023

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“…It is widely recognized that the choice of exchange-correlation functionals is crucial to the accuracy of first-principle calculations. Previous studies have demonstrated that distinct functionals can obtain different magnetic ground states of V 5 S 8 and ferroelectric properties of BaTiO 3 [30,31]. Likewise, this situation also exists in layered Cu 2 Se systems.…”

Section: Introductionmentioning

confidence: 91%

First-principle study of the electronic structure of layered Cu₂Se

Yi,

Zhang,

Zhang

et al. 2023

J. Phys.: Condens. Matter

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Copper selenide (Cu2Se) has attracted significant attention due to the extensive applications in thermoelectric and optoelectronic devices over the last few decades. Among various phase structures of Cu2Se, layered Cu2Se exhibits unique properties, such as purely thermal phase transition, high carrier mobility, high optical absorbance and high photoconductivity. Herein, we carry out a systematic investigation for the electronic structures of layered Cu2Se with several exchange-correlation functionals at different levels through first-principle calculations. It can be found that the electronic structures of layered Cu2Se are highly sensitive to the choice of functionals, and the correction of on-site Coulomb interaction also has a noticeable influence. Comparing with the results calculated with hybrid functional and G0W0 method, it is found that the electronic structures calculated with LDA+U functional are relatively accurate for layered Cu2Se. In addition, the in-plane biaxial strain can lead to the transition of electronic properties from metal to semiconductor in the layered Cu2Se, attributed to the change of atomic orbital hybridization. Furthermore, we explore the spin-orbit coupling (SOC) effect of Cu2Se and find that the weak SOC effect on electronic structures mainly results from spatial inversion symmetry of Cu2Se. These findings provide valuable insights for further investigation on this compound.

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“…2013年薛其坤团队 [279] 利用分子束外延的方法在高质量的磁性掺杂拓扑绝缘体薄膜中观察到了反常霍尔效应, 实现了低温下无需外加磁场就能观察到该现象. 最近, 周家东课题组 [104] 合成了单斜和三角的Cr 5 Te 8 薄膜, 这两个相均表现出垂直各向异性和稳健的铁磁性, 并在结构扭曲的单斜相中观察到了反常霍尔效应, 为在二维本征铁磁体中研究反常霍尔效应提供了指导.…”

Section: 自旋轨道矩unclassified

Recent research advances in two-dimensional magnetic materials

Liu¹,

Ji²

2022

Acta Phys. Sin.

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Two-dimensional (2D) magnetic materials with magnetic anisotropy can form magnetic order at finite temperature and monolayer limit. Their macroscopic magnetism is closely related to the number of layers and stacking forms, and their magnetic exchange coupling can be regulated by a variety of external fields. These novel properties endow 2D magnetic materials with rich physical connotation and potential application value, which has attracted extensive attention. In this paper, the recent advances in the experiments and theoretical calculations of 2D magnets are reviewed. Firstly, the common magnetic exchange mechanisms in several 2D magnetic materials are introduced. Then, the geometric and electronic structures of some 2D magnets and their magnetic coupling modes are introduced in detail according to their components. Furthermore, we discuss how to regulate the electronic structure and magnetism of 2D magnets by external (external field and interface) and internal (stacking and defect) methods. Then we discuss the potential of using these materials in spintronics devices and magnetic storage. Finally, the difficulties and challenges of 2D magnetic materials and the possible research directions in the future are summarized and prospected.

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Thickness-dependent magnetic order and phase transition in V₅S₈*

Cited by 6 publications

References 46 publications

Collective Magnetic Behavior in Vanadium Telluride Induced by Self-Intercalation

Collective Magnetic Behavior in Vanadium Telluride Induced by Self-Intercalation

First-principle study of the electronic structure of layered Cu₂Se

Recent research advances in two-dimensional magnetic materials

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Thickness-dependent magnetic order and phase transition in V5S8*

Cited by 6 publications

References 46 publications

Collective Magnetic Behavior in Vanadium Telluride Induced by Self-Intercalation

Collective Magnetic Behavior in Vanadium Telluride Induced by Self-Intercalation

First-principle study of the electronic structure of layered Cu2Se

Recent research advances in two-dimensional magnetic materials

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Thickness-dependent magnetic order and phase transition in V₅S₈*

First-principle study of the electronic structure of layered Cu₂Se