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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

1.8K
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

2.0K
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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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.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
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Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Superconductivity in Weyl semimetal candidate MoTe2.

Yanpeng Qi1, Pavel G Naumov1, Mazhar N Ali2

  • 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany.

Nature Communications
|March 15, 2016
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Summary

Molybdenum ditelluride (MoTe2) exhibits superconductivity, which is significantly enhanced by external pressure. This study reveals a dome-shaped phase diagram, offering insights into superconductivity and topological physics in semimetallic materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Transition metal dichalcogenides (TMDs) are researched for their unique properties.
  • Semiconducting TMDs like MoS2 are well-studied, but semimetallic TMDs like WTe2 show novel phenomena.
  • MoTe2 is theoretically predicted to be a Weyl semimetal and quantum spin Hall insulator.

Purpose of the Study:

  • Investigate the physical properties of molybdenum ditelluride (MoTe2).
  • Explore the superconductivity of bulk MoTe2.
  • Examine the effect of external pressure on MoTe2's superconductivity.

Main Methods:

  • Experimental synthesis and characterization of bulk MoTe2.
  • Superconductivity measurements under varying external pressures.
  • Analysis of the superconductivity phase diagram.

Main Results:

  • Bulk MoTe2 exhibits superconductivity with a base transition temperature of 0.10 K.
  • Applying external pressure significantly increases the transition temperature, reaching 8.2 K at 11.7 GPa.
  • A dome-shaped superconductivity phase diagram was observed for MoTe2.

Conclusions:

  • MoTe2 is a superconductor whose transition temperature is tunable with pressure.
  • The findings highlight the interplay between superconductivity and topological properties in MoTe2.
  • This research contributes to understanding semimetallic TMDs and their potential applications.