Journal ArticleDOI
Tetrahedral Transition Metal Chalcogenides as Functional Inorganic Materials
Xiuquan Zhou,Efrain E. Rodriguez +1 more
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The tetrahedral transition metal chalcogenides (TTMCs) as mentioned in this paper have a common layered structural motif that could carry novel functionalities on account of the d-orbital filling.Abstract:
We provide a perspective on a series of materials that we have termed tetrahedral transition metal chalcogenides (TTMCs), which have a common layered structural motif that could carry novel functionalities on account of the d-orbital filling. While strong covalent bonding predominates within the TTMC layers, the layers themselves can be held together by van der Waals interactions, Coulombic forces, or even hydrogen bonding. Although similar to transition metal dichalcogenides (TMDs) in some respects, TTMCs have been less explored in their synthesis and materials properties. Unlike TMDs where the transition metal is typically tetravalent and in a 6-coordinate environment, TTMCs contain the transition metal in a tetrahedral environment and in a low valent state of I or II. Structurally, TTMCs crystallize in tetragonal or orthorhombic structures on account of the square lattice formed by the transition metal centers. We present their electronic structure and resulting properties, including superconductivity,...read more
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Emerging 2D Materials and Their Van Der Waals Heterostructures.
TL;DR: In this article, state-of-the-art experimental, numerical, and theoretical research on 2D materials and their van der Waals heterojunctions for applications in electronics, optoelectronics, and energy generation is presented.
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The Role of Delocalized Chemical Bonding in Square-Net-Based Topological Semimetals
Sebastian Klemenz,Aurland K Hay,Samuel M. L. Teicher,Andreas Topp,Jennifer Cano,Leslie M. Schoop +5 more
TL;DR: In this article, the authors derive chemical rules based on atomic distances and chemical bond character, which predict topological materials in compounds that feature the structural motif of a square-net and identify over 300 potential new topological semimetals.
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Block magnetic excitations in the orbitally-selective Mott insulator BaFe$_2$Se$_3$
Martin Mourigal,Shan Wu,Matthew B. Stone,James R. Neilson,J. M. Caron,Tyrel M. McQueen,Collin Broholm +6 more
TL;DR: Using powder inelastic neutron scattering on the two-leg ladder BaFe{2}Se_{3}, the authors characterized the static and dynamic spin correlations associated with the Fe{4} block state, an exotic magnetic ground state observed in this low-dimensional magnet and in Rb{0.89}Fe_{1.58}Se{2}.
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Frustrated magnetism in the tetragonal CoSe analog of superconducting FeSe
Brandon Wilfong,Xiuquan Zhou,Hector K. Vivanco,Daniel J. Campbell,Kefeng Wang,D. Graf,Johnpierre Paglione,Efrain E. Rodriguez +7 more
TL;DR: In this article, the authors present magnetic and transport properties measurements on powders and single crystals of tetragonal CoSe, showing that the magnetic moment lies in the $ab$ plane.
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The role of delocalized chemical bonding in square-net-based topological semimetals
Sebastian Klemenz,Aurland K Hay,Samuel M. L. Teicher,Andreas Topp,Jennifer Cano,Leslie M. Schoop +5 more
TL;DR: Chemical rules, based on atomic distances and chemical bond character, are derived, which predict topological materials in compounds that feature the structural motif of a square-net, and are used to identify over 300 potential newTopological materials.
References
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Journal ArticleDOI
Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
TL;DR: In this paper, the authors reported the observation of high transition temperature (Tc) superconductivity in the FeSe/STO system by in situ 4-point probe (4PP) electrical transport measurement.
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Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films
Shaolong He,Junfeng He,Wenhao Zhang,Wenhao Zhang,Lin Zhao,Defa Liu,Xu Liu,Daixiang Mou,Yunbo Ou,Qingyan Wang,Qingyan Wang,Zhi Li,Lili Wang,Yingying Peng,Yan Liu,Chaoyu Chen,Li Yu,Guodong Liu,Xiaoli Dong,Jun Zhang,Chuangtian Chen,Zuyan Xu,Xi Chen,Xucun Ma,Qi-Kun Xue,Xingjiang Zhou +25 more
TL;DR: The phase diagram for an FeSe monolayer grown on a SrTiO3 substrate is reported, by tuning the charge carrier concentration over a wide range through an extensive annealing procedure, and strong indications of superconductivity are observed with a transition temperature of 65±5 K.
Journal ArticleDOI
Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
TL;DR: In this article, density functional calculations of the electronic structure, Fermi surface, phonon spectrum, magnetism, and electron-phonon coupling for the superconducting phase FeSe, as well as the related compounds FeS and FeTe were performed.
Journal ArticleDOI
Physical and chemical tuning of two-dimensional transition metal dichalcogenides
TL;DR: With the flexible tuning of properties 2D TMDs become attractive candidates for a variety of applications including electronics, optoelectronics, catalysis, and energy.
Journal ArticleDOI
Electronic properties of intercalation complexes of the transition metal dichalcogenides
Richard H. Friend,A D Yoffe +1 more
TL;DR: In this paper, the effects of intercalation of the layer type transition metal dichalcogenides by a variety of organic molecules, alkali metals, or 3D transition metals are discussed.