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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.
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Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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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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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Room-temperature-superconducting Tc driven by electron correlation.

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|May 15, 2021
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Summary
This summary is machine-generated.

High pressure in hydrides enables room-temperature superconductivity, explained by Brinkman-Rice (BR)-Bardeen-Cooper-Schrieffer (BCS) theory. This theory links superconductivity to a diverging effective mass and Coulomb interaction changes under pressure.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Superconductivity in hydrides under high pressure is a key area of research.
  • Understanding the mechanisms behind high-temperature superconductivity is crucial.

Purpose of the Study:

  • To provide a theoretical explanation for room-temperature superconductivity in hydrides.
  • To elucidate the role of electronic correlations and effective mass in superconductivity.

Main Methods:

  • Theoretical modeling combining Brinkman-Rice (BR) and Bardeen-Cooper-Schrieffer (BCS) theories.
  • Analysis of the on-site Coulomb interaction (U) and its transition to a critical value (Uc).
  • Investigation of the effective mass divergence (m*/m).

Main Results:

  • A unified theoretical framework (BR-BCS) explains high-Tc superconductivity in hydrides.
  • Superconductivity arises from a transition in the on-site Coulomb interaction (U to Uc).
  • Diverging effective mass is a key factor linked to the superconducting transition.

Conclusions:

  • High pressure or low temperature induces volume contraction, driving the U to Uc transition.
  • The BR-BCS model successfully describes superconductivity in these correlated systems.
  • This provides a pathway to understanding and potentially designing new superconducting materials.