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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...
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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...
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Theory of Metallic Conduction

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Ferromagnetism

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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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Unconventional high-temperature superconductivity from repulsive interactions: theoretical constraints.

A S Alexandrov1, V V Kabanov

  • 1Department of Physics, Loughborough University, Loughborough LE11 3TU, United Kingdom.

Physical Review Letters
|April 27, 2011
PubMed
Summary
This summary is machine-generated.

Purely repulsive electron interactions do not cause superconductivity without phonons in high-temperature superconductors. Cooper pairing in p and d states is impossible with realistic Coulomb repulsion at relevant temperatures.

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics

Background:

  • Unconventional symmetries in the order parameter have led to theories of phonon-free superconductivity.
  • These theories propose that purely repulsive electron interactions can drive superconductivity in certain high-temperature materials.

Purpose of the Study:

  • To investigate the theoretical possibility of phonon-free superconductivity driven by Coulomb repulsion.
  • To determine if Cooper pairing in p and d states is feasible under realistic conditions.

Main Methods:

  • Theoretical analysis of fermion interactions.
  • Examination of Cooper pairing mechanisms in various dimensions.

Main Results:

  • Cooper pairing in p and d states is not possible with realistic Coulomb repulsion.
  • This holds true for relevant temperatures across all dimensions.

Conclusions:

  • Theories suggesting purely repulsive interactions can cause superconductivity without phonons are invalidated.
  • Phonon-mediated interactions remain a crucial factor for superconductivity in p and d states.