Signature of coexistence of superconductivity and ferromagnetism in two-dimensional NbSe2 triggered by surface molecular adsorption

Zhu, Xiaojiao; Guo, Yuqiao; Cheng, Hao; Dai, Jun; An, Xingda; Zhao, Jin; Tian, Ke; Wei, Shiqiang; Zeng, Xiao Cheng; Wu, Changzheng; Xie, Yi

doi:10.1038/ncomms11210

Cited by 94 publications

(80 citation statements)

References 39 publications

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“…[9][10][11] The 2D ferromagnetic materials (2D FMs), 12 were predicted to have promising spintronic applications [13][14][15][16] with stable storage, faster response and low-power dissipation. 12,17 To this end, two approaches are currently adopted involving the introduction of defects or adatoms into parent materials or the proximity effect with ferromagnetic materials, 18 for instance, the ferromagnetism in NbSe 2 through hydrogen absorbed on the surface, 19 and the search for the intrinsic magnetic materials. However, the resulting ferromagnetic materials by the former method significantly suffer from the undesired stability and limited controllability.…”

Section: Introductionmentioning

confidence: 99%

Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy

et al. 2017

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Recently, layered two-dimensional ferromagnetic materials (2D FMs) have attracted a great deal of interest for developing lowdimensional magnetic and spintronic devices. Mechanically exfoliated 2D FMs were discovered to possess ferromagnetism down to monolayer. It is therefore of great importance to investigate the distinct magnetic properties at low dimensionality. Here, we report the wafer-scale growth of 2D ferromagnetic thin films of Fe 3 GeTe 2 via molecular beam epitaxy, and their exotic magnetic properties can be manipulated via the Fe composition and the interface coupling with antiferromagnetic MnTe. A 2D layer-by-layer growth mode has been achieved by in situ reflection high-energy electron diffraction oscillations, yielding a well-defined interlayer distance of 0.82 nm along {002} surface. The magnetic easy axis is oriented along c-axis with a Curie temperature of 216.4 K. Remarkably, the Curie temperature can be enhanced when raising the Fe composition. Upon coupling with MnTe, the coercive field dramatically increases 50% from 0.65 to 0.94 Tesla. The large-scale layer-by-layer growth and controllable magnetic properties make Fe 3 GeTe 2 a promising candidate for spintronic applications. It also opens up unprecedented opportunities to explore rich physics when coupled with other 2D superconductors and topological matters.

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Section: Introductionmentioning

confidence: 99%

Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy

et al. 2017

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“…Despite of the difficulty in direct determination of c,VS 2 using the transfer length method, the on-state c,VS 2 could be estimated to be less than 1/4 of that of Ni/Au contacts ( c,Ni ), since c,VS 2 44 . The greatly improved device performance is attributed to the highquality vdW interface which is free of Fermi level pinning effects 45 , thus enabling efficient charge injection from the VS2 electrode into the MoS2 channel (more discussion can be found in Supplementary Figure S12).…”

Section: Resultsmentioning

confidence: 99%

Metallic Vanadium Disulfide Nanosheets as a Platform Material for Multifunctional Electrode Applications

et al. 2017

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Nanothick metallic transition metal dichalcogenides such as VS2 are essential building blocks for constructing next-generation electronic and energy-storage applications, as well as for exploring unique physical issues associated with the dimensionality effect. However, such two-dimensional (2D) layered materials have yet to be achieved through either mechanical exfoliation or bottom-up synthesis. Herein, we report a facile chemical vapor deposition route for direct production of crystalline VS2 nanosheets with sub-10 nm thicknesses and domain sizes of tens of micrometers. The obtained nanosheets feature spontaneous superlattice periodicities and excellent electrical conductivities (∼3 × 103 S cm–1), which has enabled a variety of applications such as contact electrodes for monolayer MoS2 with contact resistances of ∼1/4 to that of Ni/Au metals, and as supercapacitor electrodes in aqueous electrolytes showing specific capacitances as high as 8.6 × 102 F g–1. This work provides fresh insights into the delicate structure–property relationship and the broad application prospects of such metallic 2D materials.

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“…These 2D materials have enabled unprecedented developments in electronic devices, valleytronics, and electrocatalysis. Recently, metallic TMDs, such as TiSe 2 , NbSe 2 , TaSe 2 , and TaS 2 , have gained considerable attention on account of their unique characteristics that include magnetism, superconductivity and charge‐density waves (CDWs) . 2D metallic TMD materials represent an essential component of the 2D family.…”

Section: D Metallic Tmdsmentioning

confidence: 99%

Recent Progress in CVD Growth of 2D Transition Metal Dichalcogenides and Related Heterostructures

et al. 2019

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www.advmat.de www.advancedsciencenews.com production challenging. Since the discovery of the chemical vapor deposition (CVD) method as a successful approach for the growth of graphene crystals, [53,54] the method has also been expanded to the preparation of other 2D layered materials. Currently, this approach has been extended to rationally design various 2D TMD materials, such as MoS 2 nanosheets, [55][56][57][58] MoSe 2 nanosheets, [59,60] WS 2 nanosheets, [61,62] ReS 2 nanosheets, [63] and some heterostructures, [64,65] which have sparkled several interesting chemical and electronic properties. Although various 2D TMDs have been successfully grown using a facile CVD method, the intrinsic growth mechanism and the batch production of wafer-scale films, conducive to the high-performance in electronics/optoelectronics and other fields, still need more exploration. Very recently, some important progress on the synthesis of 2D TMDs, multi-heterostructures and superlattices has been realized.Herein, we concentrate on the recent progress in the synthesis of 2D TMDs and related heterostructures via the CVD method. We start with the effects of some key factors such as temperature, carrier gas, and the ratio of precursors on the synthesis of 2D TMDs via CVD technique. Then we summarize the importance of the growth substrates and the growth system to large-scale synthesis. Hence, large-scale 2D TMDs have been obtained on the basis of properly designed CVD growth. Furthermore, some recent breakthroughs in the growth of new kinds of semiconducting and metallic 2D TMDs via the CVD technique are described. The fundamental electronic properties and unique physical phenomena emanating from high quality CVD-grown TMDs are also reviewed. Finally, the controlled growth of alloys with tunable band structures, different multiheterostructures with atomically sharp interfaces and superlattices from 2D TMD crystals is analyzed, which can offer further step for the synthesis of 2D crystals and provides significantly more material systems. Lastly, we emphasize a summary of this review and the future prospects of these materials.Recently, the CVD method has been widely regarded as a technique available for growing 2D atomic crystals. Various atomically thin layered MX 2 semiconductors, such as MoS 2 , [55,66,67] WS 2 , [68] MoSe 2 , [69] MoTe 2 , [70,71] etc., have been successfully achieved by the CVD method. Through in-depth research on the growth dynamics in the CVD system, several key factors in the growth process for obtaining a large-scale, uniform monolayer MX 2 have been explored. For example, triangular WS 2 flakes were synthesized on a sapphire substrate via a CVD system, and a detailed analysis of the controllable growth behavior was given. [61] The growth system is maintained at a very low pressure during the growth process via an operating pump, which provides a uniform flow of vapor precursors and is beneficial to the uniform growth. First, the distance between the source and substrate (D ss ) was discovered to be a vital fa...

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Signature of coexistence of superconductivity and ferromagnetism in two-dimensional NbSe2 triggered by surface molecular adsorption

Cited by 94 publications

References 39 publications

Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy

Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy

Metallic Vanadium Disulfide Nanosheets as a Platform Material for Multifunctional Electrode Applications

Recent Progress in CVD Growth of 2D Transition Metal Dichalcogenides and Related Heterostructures

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