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Related Concept Videos

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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Types Of Superconductors01:28

Types Of Superconductors

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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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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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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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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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Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

2.0K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Tailoring Superconductivity with Quantum Dislocations.

Mingda Li, Qichen Song, Te-Huan Liu

  • 1Department of Physics, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.

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|July 6, 2017
PubMed
Summary
This summary is machine-generated.

Crystal dislocations influence superconductivity through two interactions: potential scattering and quantum attraction from dislons. This clarifies how dislocations can increase or decrease superconducting transition temperature (Tc), agreeing with experiments.

Keywords:
Dislocationsdisordered superconductoreffective field theoryelectron-dislocation interaction

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Crystal dislocations are known to impact superconducting properties, but the precise electron-dislocation interaction mechanism remains unclear.
  • Experimentally observed variations in superconducting transition temperature (Tc) due to dislocations, including increases and decreases, lack a unified theoretical explanation.
  • Existing models for impurity-induced Tc reduction do not fully account for the complexity of dislocation interactions.

Purpose of the Study:

  • To elucidate the fundamental mechanism of electron-dislocation interactions in superconductors.
  • To explain the varied experimental effects of dislocations on superconducting transition temperature (Tc).
  • To provide a quantitative framework for understanding and engineering dislocation-mediated superconductivity.

Main Methods:

  • Generalization of the one-dimensional quantized dislocation field to three dimensions.
  • Theoretical analysis of two distinct electron-dislocation interactions: potential scattering and quantum attraction via dislons.
  • Development of a quantitative criterion for predicting Tc modification based on material properties and confinement.

Main Results:

  • Identified two key electron-dislocation interactions: classical potential scattering and quantum attraction mediated by dislons.
  • Demonstrated that the interplay between these classical and quantum effects determines the net impact on Tc.
  • Achieved excellent agreement between the theoretical model and existing experimental data for dislocated superconductors.

Conclusions:

  • The study clarifies the dual role of dislocations in superconductivity as a competition between classical and quantum effects.
  • Provides a theoretical basis for the observed increase or decrease in Tc in dislocated materials.
  • Offers a new avenue for manipulating superconducting properties by controlling dislocations, particularly in nanostructures.