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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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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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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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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
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Type-III Superconductivity.

M Cristina Diamantini1, Carlo A Trugenberger2, Sheng-Zong Chen3

  • 1NiPS Laboratory, INFN and Dipartimento di Fisica e Geologia, University of Perugia, via A. Pascoli, Perugia, I-06100, Italy.

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Summary
This summary is machine-generated.

This study explores superconductivity in granular materials, revealing a new mechanism replacing the standard Anderson-Higgs model. Experimental data confirm a unique resistance scaling near the superconducting transition.

Keywords:
Berezinskii-Kosterlitz-Thouless transitionsuperconductivityvortex deconfinement

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Area of Science:

  • Condensed Matter Physics
  • Quantum Phenomena

Background:

  • Superconductivity is a macroscopic quantum phenomenon typically explained by Ginzburg-Landau (GL) theory and the Anderson-Higgs mechanism for electromagnetic field screening.
  • Granular superconductors, however, present a different scenario where the standard Anderson-Higgs mechanism is insufficient.

Purpose of the Study:

  • To investigate an alternative theoretical framework for superconductivity in granular materials.
  • To introduce the Deser-Jackiw-Templeton topological mass generation and topological gauge theory as replacements for GL theory in these systems.
  • To analyze the nature of the superconducting transition in 3D granular superconductors.

Main Methods:

  • Replacing Ginzburg-Landau effective field theory with an effective topological gauge theory.
  • Characterizing the superconducting transition as a 3D generalization of the 2D Berezinskii-Kosterlitz-Thouless vortex transition.
  • Analyzing the binding-unbinding of line-like vortices in 3D granular superconductors.

Main Results:

  • Demonstrated that the Anderson-Higgs mechanism is not applicable to granular superconductors.
  • Established that a topological gauge theory is required for these systems.
  • Identified the superconducting transition as a 3D vortex binding-unbinding phenomenon.
  • Observed Vogel-Fulcher-Tamman (VFT) scaling of resistance near the transition.

Conclusions:

  • Granular superconductors necessitate a departure from standard GL theory, employing topological mass generation.
  • The superconducting transition in these materials is governed by 3D vortex dynamics, leading to VFT scaling.
  • Experimental findings validate the theoretical predictions, confirming VFT behavior in granular superconductor resistance.