Journal ArticleDOI
Variations In The Conductive And Superconductive Properties Of {[tise2](l)[nbse2](m)}(n) Superlattices As A Function Of Superlattice Structure
TLDR
In this paper, an extensive set of {[TiSe2]l[NbSe2 ]m}n superlattices has been prepared through controlled annealing of elementally modulated reactants.Abstract:
An extensive set of {[TiSe2]l[NbSe2]m}n superlattices has been prepared through controlled annealing of elementally modulated reactants. Electrical conductances were measured from 1.5 K to room temperature. The room temperature conductances are linearly dependent on the number (m) of NbSe2 layers per repeat layer, and independent of the number (l) of semimetallic TiSe2 layers per repeat layer, suggesting that the electronic transport is dominated by the metallic NbSe2 layers. For small l, a positive temperature coefficient of resistance (TCR) is observed, indicative of normal metallic behavior. In general, increasing l reduces the TCR, and for smaller m, the TCR becomes negative at larger l. These samples exhibit a √T temperature dependence to the resistivity variation at low temperatures, characteristic of both weak localization and electron−electron interaction effects for three-dimensional electron flow in strongly disordered systems. Superconducting critical temperatures were also observed to depend s...read more
Citations
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Density functionals and model Hamiltonians: Pillars of many-particle physics
Klaus Capelle,Vivaldo L. Campo +1 more
TL;DR: In this paper, the authors describe connections between density functional theory (DFT) and model Hamiltonians, and illustrate the connections for the Hubbard model and the Heisenberg model, as well as other models that have been treated with DFT.
Journal ArticleDOI
Polystyrene nanocomposites based on quinolinium and pyridinium surfactants
TL;DR: In this article, pyridine and quinoline-containing salts were employed to modify montmorillonite and X-ray diffraction and transmission electron microscopy results showed the formation of intercalated structures.
Journal ArticleDOI
Non-Wigner-Dyson level statistics and fractal wave function of disordered Weyl semimetals
TL;DR: In this paper, the level statistics and the fractal nature of electron wave function around Weyl nodes (WNs) of disordered Weyl semimetals (WSMs) are investigated.
Journal ArticleDOI
Atmospheric pressure chemical vapour deposition of NbSe2–TiSe2 composite thin films
TL;DR: In this article, atmospheric pressure chemical vapour deposition of titanium tetrachloride and niobium pentachlorides with di- tert -butyl selenide at 550°C was investigated for different precursors' flow rates.
Journal ArticleDOI
Low temperature synthesis using modulated elemental reactants: a new metastable ternary compound, NixMoSe2
TL;DR: In this paper, the authors reported the synthesis of a new metastable ternary compound Ni x MoSe 2, which was prepared from a modulated elemental reactant, containing alternating layers of Ni, Mo, and Se, by high vacuum deposition onto an ambient temperature substrate.
References
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Journal ArticleDOI
New Method for High-Accuracy Determination of the Fine-Structure Constant Based on Quantized Hall Resistance
TL;DR: In this article, the Hall voltage of a two-dimensional electron gas, realized with a silicon metal-oxide-semiconductor field effect transistor, was measured and it was shown that the Hall resistance at particular, experimentally well-defined surface carrier concentrations has fixed values which depend only on the fine-structure constant and speed of light, and is insensitive to the geometry of the device.
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Disordered electronic systems
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Two-Dimensional Magnetotransport in the Extreme Quantum Limit
TL;DR: The formation of a Wigner solid or charge-density-wave state with triangular symmetry is suggested as a possible explanation for the formation of the Hall plateau in magnetotransport of high-mobility, two-dimensional electrons as mentioned in this paper.
Journal ArticleDOI
The transition metal dichalcogenides discussion and interpretation of the observed optical, electrical and structural properties
J.A. Wilson,A.D. Yoffe +1 more
TL;DR: The transition metal dichalcogenides are about 60 in number as discussed by the authors, and two-thirds of these assume layer structures and can be cleaved down to less than 1000 A and are then transparent in the region of direct band-to-band transitions.
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Charge-density waves and superlattices in the metallic layered transition metal dichalcogenides
TL;DR: In this paper, it was shown that charge-density waves and their concomitant periodic structural distortions occur in all the 4d1/5d1 dichalcogenides and related the observed periodicities of these CDW states to the theoretical form of the parent Fermi surfaces.