Lanthanide f7 metalloxenes – a class of intrinsic 2D ferromagnets

Tokmachev, Andrey M.; Averyanov, Dmitry V.; Талденков, А. Н.; Parfenov, Oleg E.; Karateev, Igor A.; Sokolov, Ivan S.; Storchak, Vyacheslav G.

doi:10.1039/c9mh00444k

Cited by 60 publications

(111 citation statements)

References 49 publications

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“…This idea might pave ways for designing novel 2D FM materials in spin applications. [ 34,72 ] As transformation from 3D AFM (in the bulk) into 2D FM (in 2D materials) is almost common, Storchak et al. demonstrated the 2D FM of EuC 6 , which is similar to that in EuSi 2 and EuGe 2 (Figure 6d–f).…”

Section: Properties and Applicationsmentioning

confidence: 87%

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Recent Advances in 2D Rare Earth Materials

Chen

Han

Zhao

et al. 2020

Adv Funct Materials

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2D rare earth (RE) materials have received considerable attention in recent years due to the fascinating luminescence, magnetism, and electric properties originated from RE associated with sharp and various emission peaks, intrinsic 2D ferromagnetism, and incommensurate charge density wave. These materials might open up a new prospect in next‐generation lighting, magnetic devices, and phototransistors. Herein, a comprehensive review of 2D RE materials is presented, focusing on their recent progresses. First, the crystal structures of 2D RE materials are discussed. Then, typical synthesis methods such as mechanical exfoliation, molecular beam epitaxy, pulsed laser deposition, and chemical vapor deposition are introduced. Furthermore, various properties in luminescence, magnetism, and electronics are summarized. The recently reported RE‐based 2D novel photodetectors are outlined as three constructions: MoS2/RE, graphene/RE, and perovskite/RE, which show promising applications for both narrow and broad band detection arised from the special absorption windows of different RE elements. Finally, the conclusions and outlook of this area are proposed, such as exploring novel 2D RE compounds, improving stability, and broadening applications.

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Section: Properties and Applicationsmentioning

confidence: 87%

“…In MX 2 , Eu or Gd forms the triangular lattice, while silicene or germanene forms the 2D honeycomb network. [ 72 ] Similar to MX 2 , EuC 6 is also with a layer structure, shown in Figure 1b. The difference is that EuC 6 has different stoichiometric ratios.…”

Section: Crystal Structuresmentioning

confidence: 99%

Recent Advances in 2D Rare Earth Materials

Chen

Han

Zhao

et al. 2020

Adv Funct Materials

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“…The reactions proposed and implemented in the present work—leading from elemental X to binary MX 2 to ternary MA 2 X 2 —hold promise for synthesis of oriented nanomaterials with tailored functionalities; monolayer structures of MA 2 X 2 are particularly enticing, by analogy with their MX 2 counterparts. [ 35,36,47 ] Curiously, 1D synthetic routes exist for both layered and non‐layered compounds, although via different mechanisms. The successful synthesis of new materials of various classes is important; however, what is more important in our opinion is that it illustrates i) the concept of dimensionality and ii) efficient control over the corresponding solid‐state reactions at the nanoscale.…”

Section: Resultsmentioning

confidence: 99%

“…The first step is production of metalloxene MX 2 . Recently, we synthesized epitaxial films of MSi 2 on Si(111) [ 11,12,35 ] and MGe 2 on Ge(111) [ 36,37 ] by depositing M atoms to the surfaces of Si and Ge, respectively:

M + 2 X = {MX}_{2}

…”

Section: Resultsmentioning

confidence: 99%

Dimensionality Concept in Solid‐State Reactions: A Way to Control Synthesis of Functional Materials at the Nanoscale

Tokmachev

Averyanov

Karateev

et al. 2020

Adv Funct Materials

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The concept of dimensionality is fundamental in physics, chemistry, materials science, etc. Low-dimensional and layered materials are distinguished by their unique physical properties and applications. Concurrently, low-dimensional reactants, products, and reaction spaces extend the toolbox of materials science considerably. Here, the concept of dimensionality is adapted to solid-state reactions by counting the basic axes along which the unit cell undergoes significant expansion/shrinking. For illustration, 1D synthesis of layered ternary compounds MA 2 X 2 via derivatives of 2D-Xenes, silicene, and germanene, is demonstrated, and the reaction mechanism and the role of templates are determined. The approach is then extended to 1D synthesis of non-layered compounds. The 1D nature of the reactions, established with structural studies, is explored by nanoscale confinement. The mutual orientation of the reaction and confinement-parallel (thus preventing the lattice expansion) or orthogonal-controls the reaction pathways and outcome. The work provides a proof-of-concept for anisotropic reactivity caused by directional confinement.

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“…The lanthanides (Ln) have proven to be fertile ground in this arena, 1 with Ln atomic ions, molecules, and materials finding applications in the areas of quantum simulators 2 and single molecule magnets, 3 the latter of which is associated with potential application in spintronics materials. 4 The Ln 4f n series is characterized by elements having similar chemical properties, for as the atomic number increases, the occupancy of the contracted and nuclear-shielding 4f n subshell increases.…”

Section: Introductionmentioning

confidence: 99%

Photoelectron Spectra of Gd2O2− and Non-Monotonic Photon-Energy Dependent Variations in Populations of Close-Lying Neutral States

Mason¹,

Harb²,

Taka³

et al. 2020

Preprint

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Photoelectron spectra of Gd2O2− obtained with photon energies from 2.033 eV to 3.495 eV exhibit numerous close-lying neutral states with photon-energy-dependent relative intensities. Transitions to states falling within the electron binding energy window of 0.9 and 1.6 eV are attributed to one- or two-electron transitions to the ground and low-lying excited neutral states. An additional, manifold of electronic states observed in the 2.1 to 2.8 eV window cannot be assigned to any simple one-electron transitions. Because of the relatively simple electronic structure from the half-filled 4f7 subshell occupancy in Gd2O2–, the numerous transitions observed in the spectra are fairly well-resolved, allowing a detailed view of the changes in relative intensities of individual transitions with photon energy. With supporting calculations on the numerous close-lying electronic states, we suggest a description of strong photoelectron-valence electron interactions that result in the photon-energy dependent shake-up transitions and switching between ferro- and antiferromagnetic coupling.

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Lanthanide f⁷ metalloxenes – a class of intrinsic 2D ferromagnets

Abstract: A class of intrinsic 2D ferromagnets – layered metalloxenes – is established by coupling graphene-like honeycomb networks of silicene and germanene with 2D lanthanide layers.

Cited by 60 publications

References 49 publications

Recent Advances in 2D Rare Earth Materials

Recent Advances in 2D Rare Earth Materials

Dimensionality Concept in Solid‐State Reactions: A Way to Control Synthesis of Functional Materials at the Nanoscale

Photoelectron Spectra of Gd2O2− and Non-Monotonic Photon-Energy Dependent Variations in Populations of Close-Lying Neutral States

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