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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

1.5K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Superconductor01:24

Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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Van der Waals Interactions01:24

Van der Waals Interactions

69.3K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Van der Waals Equation01:10

Van der Waals Equation

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The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Clean 2D superconductivity in a bulk van der Waals superlattice.

A Devarakonda1, H Inoue1, S Fang2

  • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science (New York, N.Y.)
|October 9, 2020
PubMed
Summary

Researchers created a new clean-limit two-dimensional (2D) superconductor using a niobium disulfide superlattice. This breakthrough enables the study of exotic superconductivity in 2D materials with fragile pairing symmetries.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • Advances in low-dimensional superconductivity rely heavily on improved material quality.
  • A lack of clean-limit two-dimensional (2D) superconductors hinders research into exotic superconductivity with fragile pairing symmetries.
  • Organic materials are a small exception to the general scarcity of 2D superconductors.

Purpose of the Study:

  • To develop a novel inorganic 2D superconductor with high electronic quality and clean-limit properties.
  • To overcome the limitations imposed by the absence of suitable 2D superconducting materials.
  • To create a platform for exploring exotic superconductivity phenomena in two dimensions.

Main Methods:

  • Fabrication of a bulk superlattice structure.
  • Integration of the transition metal dichalcogenide (TMD) superconductor 2H-niobium disulfide (2H-NbS2) with a commensurate block layer.
  • Characterization of the material's electronic properties and dimensionality.

Main Results:

  • Achieved enhanced two-dimensionality and high electronic quality in the synthesized material.
  • Demonstrated clean-limit inorganic 2D superconductivity.
  • Developed a superlattice structure with potential for broader applications.

Conclusions:

  • The developed superlattice provides a new avenue for realizing clean-limit 2D superconductivity.
  • This material platform can be extended to create novel 2D topological insulators and excitonic systems based on TMDs.
  • The findings pave the way for exploring exotic superconductivity and other quantum phenomena in low-dimensional materials.