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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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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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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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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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The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Quantum Bipolaron Superconductivity from Quadratic Electron-Phonon Coupling.

Zhaoyu Han1, Steven A Kivelson1, Pavel A Volkov2,3

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This summary is machine-generated.

Quantum effects enable electron pairing, forming bipolarons and leading to superconductivity. This mechanism, unlike linear coupling, shows mild suppression of critical temperature, suggesting higher potential for achieving superconductivity in materials like perovskites.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Materials Science

Background:

  • Electron pairing is crucial for superconductivity.
  • Phonon-mediated electron-phonon coupling is a known mechanism for superconductivity.
  • Quantum zero-point fluctuations can influence electron behavior.

Purpose of the Study:

  • To investigate superconductivity arising from quadratic electron-phonon coupling.
  • To analyze the impact of strong coupling on critical temperature (Tc) in this mechanism.
  • To explore the potential of this pairing mechanism in real materials.

Main Methods:

  • Theoretical study using a minimal model.
  • Analysis of electron pairing due to phonon zero-point fluctuations.
  • Comparison with superconductivity in linearly coupled systems.

Main Results:

  • Quadratic electron-phonon coupling leads to bipolaron formation via quantum effects.
  • In the strong coupling regime, critical temperature (Tc) is only mildly suppressed.
  • This contrasts with exponential suppression seen in linear coupling, implying higher optimal Tc.
  • Large coupling constants are found in materials like perovskites.

Conclusions:

  • Superconductivity mediated by quadratic electron-phonon coupling offers a promising route to higher critical temperatures.
  • The quantum nature of bipolaron formation is key to overcoming strong coupling limitations.
  • Materials like perovskites and engineered superlattices are potential candidates for realizing this type of superconductivity.