Charge density waves in some Nb and Ta chalcogenides

Prodan, A.; Marinković, V.; Boswell, F.W.; Bennett, J.C.; Remškar, Maja

doi:10.1016/0925-8388(94)05011-2

Cited by 14 publications

(12 citation statements)

References 30 publications

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“…Even though the cavities of neighboring layers are located directly above each other, nearly rectangular tunnels along h011i directions are formed. The Ta/Ta distances of 3.119(2) (K) and 3.126 (2) A are comparable to those in A x TaPS 6 (A ¼ K, Rb). 75,76 The oxidation state of Ta is reduced to Ta 4.58+ .…”

Section: Structural Diversity Of Quaternary Group 5 Thiophosphatesmentioning

confidence: 53%

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Structural diversity of rare earth and transition metal thiophosphates

Bensch

2010

CrystEngComm

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Technological interest in the design of solid state materials has stimulated recent research into the development of mild molten polychalcophosphate salt fluxes for the synthesis of complex, multinary rare earth and transition metal thiophosphate compounds. The reaction pathways from elemental or metal sulfide sources can be influenced by a variety of often interdependent factors of which counter cation sizes and charges, basicity, and temperature are of paramount importance. In rare earth and transition metal containing thiophosphates the dominating structural building units are tetrahedral [PS 4 ] 3À or ethane-like [P 2 S 6 ] 4À anions. Hierarchical topological relations between individual members of structural families of the type A m M n P y S z (A ¼ alkali metal, M ¼ rare earth or transition metal) can be established that provide a detailed insight into probable mechanisms of formation. The findings enable the development of guidelines for the employment of suitable counter cations in controlling the condensation of small species into chains, layers or frameworks.

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Section: Structural Diversity Of Quaternary Group 5 Thiophosphatesmentioning

confidence: 53%

“…81 The crystal structures of A 4 Ta 4 P 4 S 24 (A ¼ K, Rb, Cs) and Cs 2 Ta 2 P 2 S 12 consist of 2 N [Ta 4 P 4 S 24 ] 4À resp. 2 N [Ta 2 P 2 S 12 ] 2À layers and chargecompensating A + cations (Fig. 11).…”

Section: Structural Diversity Of Quaternary Group 5 Thiophosphatesmentioning

confidence: 99%

Structural diversity of rare earth and transition metal thiophosphates

Bensch

2010

CrystEngComm

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“…Although the small resistance and the commensurate nature of the CDW hinder the investigation of the collective mode's contribution to the conductance of bulk TaTe 4 , the nanoscale samples with higher resistance might offer the chance to detect axion dynamics and optical methods could also be helpful [21]. Another promising way is to investigate Nb doped TaTe 4 , which is found to tune the CDW phase from commensurate to incommensurate [27,54]. Further investigations on the interplay between the CDW and topology in TaTe 4 are of great research interest.…”

Section: Discussionmentioning

confidence: 99%

Eightfold fermionic excitation in a charge density wave compound

Zhang

Sun

et al. 2020

Phys. Rev. B

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Unconventional quasiparticle excitations in condensed matter systems have become one of the most important research frontiers. Beyond twofold and fourfold degenerate Weyl and Dirac fermions, threefold, sixfold, and eightfold symmetry protected degeneracies have been predicted. However they remain challenging to realize in solid state materials. Here the charge density wave compound TaTe 4 is proposed to hold eightfold fermionic excitation and Dirac point in energy bands. High quality TaTe 4 single crystals are prepared, where the charge density wave is revealed by directly imaging the atomic structure and a pseudogap of about 45 meV on the surface. Shubnikov-de Haas oscillations of TaTe 4 are consistent with band structure calculation. Scanning tunneling microscopy/spectroscopy reveals atomic step edge states on the surface of TaTe 4 . This work uncovers that the charge density wave is able to induce new topological phases and sheds new light on the novel excitations in condensed matter materials.

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“…Since the discovery of charge-density-wave (CDW) in TMDCs, the layered TMDCs have become model materials for investigating the mechanism of CDW. 114 For example, TaS 2 crystals consist of a S−Ta−S sandwich structure with covalent bonding among S and Ta inside sandwiches and weak van der Waals bonding between the layers. The coordination of Ta atoms can be either octahedral or trigonal prismatic, leading to the stacking with 1T or 2H coordination polytypes.…”

Section: Lateral Stitched 2d Heterostructurementioning

confidence: 99%

Epitaxial Growth of Two-Dimensional Layered Transition-Metal Dichalcogenides: Growth Mechanism, Controllability, and Scalability

et al. 2017

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Recently there have been many research breakthroughs in two-dimensional (2D) materials including graphene, boron nitride (h-BN), black phosphors (BPs), and transition-metal dichalcogenides (TMDCs). The unique electrical, optical, and thermal properties in 2D materials are associated with their strictly defined low dimensionalities. These materials provide a wide range of basic building blocks for next-generation electronics. The chemical vapor deposition (CVD) technique has shown great promise to generate high-quality TMDC layers with scalable size, controllable thickness, and excellent electronic properties suitable for both technological applications and fundamental sciences. The capability to precisely engineer 2D materials by chemical approaches has also given rise to fascinating new physics, which could lead to exciting new applications. In this Review, we introduce the latest development of TMDC synthesis by CVD approaches and provide further insight for the controllable and reliable synthesis of atomically thin TMDCs. Understanding of the vapor-phase growth mechanism of 2D TMDCs could benefit the formation of complicated heterostructures and novel artificial 2D lattices.

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Charge density waves in some Nb and Ta chalcogenides

Cited by 14 publications

References 30 publications

Structural diversity of rare earth and transition metal thiophosphates

Structural diversity of rare earth and transition metal thiophosphates

Eightfold fermionic excitation in a charge density wave compound

Epitaxial Growth of Two-Dimensional Layered Transition-Metal Dichalcogenides: Growth Mechanism, Controllability, and Scalability

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