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Related Concept Videos

Superconductor01:24

Superconductor

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...
Types Of Superconductors01:28

Types Of Superconductors

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...
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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,...
Electric Field Inside a Conductor01:20

Electric Field Inside a Conductor

When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then has...
Charging Conductors By Induction01:15

Charging Conductors By Induction

The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
Equipotential Surfaces and Conductors01:16

Equipotential Surfaces and Conductors

For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic situation, if a...

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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Superconductivity without nesting in LiFeAs.

S V Borisenko1, V B Zabolotnyy, D V Evtushinsky

  • 1Leibniz-Institute for Solid State Research, IFW-Dresden, D-01171 Dresden, Germany.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Researchers explored the electronic structure of LiFeAs superconductors. Key findings include strong band renormalization and a van Hove singularity, suggesting these properties are crucial for iron pnictide superconductivity.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Superconductivity in iron pnictides is a significant area of research.
  • Understanding the electronic structure is key to explaining the mechanism of superconductivity.

Purpose of the Study:

  • To investigate the electronic structure of the nonmagnetic LiFeAs superconductor.
  • To identify the electronic properties contributing to superconductivity in iron pnictides.

Main Methods:

  • Angle-resolved photoemission spectroscopy (ARPES) was employed.
  • ARPES allows for detailed study of the electronic band structure and Fermi surface.

Main Results:

  • Absence of Fermi surface nesting was observed.
  • Strong renormalization (factor of 3) of conduction bands was detected.
  • A high density of states at the Fermi level, attributed to a van Hove singularity, was found.
  • Isotropic superconducting energy gaps were observed, with no evidence of static or fluctuating order.

Conclusions:

  • The observed electronic properties, including band renormalization and van Hove singularity, are likely essential for superconductivity in LiFeAs.
  • These findings provide insights into the broader mechanism of superconductivity in iron pnictide materials.