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Related Concept Videos

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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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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Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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Energy Bands in Solids01:01

Energy Bands in Solids

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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
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Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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Multiband Material with a Quasi-1D Band as a Robust High-Temperature Superconductor.

T T Saraiva1, P J F Cavalcanti2, A Vagov3

  • 1National Research University Higher School of Economics, 101000 Moscow, Russia.

Physical Review Letters
|December 4, 2020
PubMed
Summary
This summary is machine-generated.

Superconductivity in quasi-one-dimensional (Q1D) materials is enhanced by coupling to higher-dimensional condensates. This coupling suppresses fluctuations, significantly increasing the critical temperature in multiband Q1D superconductors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Superconductivity in quasi-one-dimensional (Q1D) materials is typically limited by strong fluctuations of the order parameter.
  • These fluctuations reduce critical temperatures and can prevent superconductivity entirely.
  • Multiband superconductors offer a potential avenue to overcome these limitations.

Purpose of the Study:

  • To investigate how coupling a Q1D condensate to a higher-dimensional condensate affects superconductivity.
  • To explore the role of interband coupling in stabilizing superconductivity in Q1D systems.
  • To understand the impact of Lifshitz transitions on critical temperatures in multiband Q1D superconductors.

Main Methods:

  • Theoretical modeling of multiband superconductors with Q1D components.
  • Analysis of order parameter fluctuations in coupled condensate systems.
  • Investigation of the influence of Fermi level tuning and Lifshitz transitions.

Main Results:

  • Coupling a Q1D pair condensate to a higher-dimensional stable condensate dramatically suppresses fluctuations.
  • Even weak interband pair-exchange coupling stabilizes the superconductor, allowing mean-field theory descriptions.
  • Low-dimensionality effects enhance system coherence when coupled to a higher-dimensional condensate.
  • Critical temperatures can increase by orders of magnitude near a Lifshitz transition.

Conclusions:

  • Coupling to higher-dimensional condensates is a viable strategy to enhance superconductivity in Q1D materials.
  • Multiband Q1D superconductors exhibit enhanced stability and significantly higher critical temperatures.
  • Tuning the Fermi level to a Lifshitz transition offers a pathway to achieve high-Tc superconductivity in these systems.