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Related Concept Videos

Superconductor01:24

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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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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 physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect. According to this equation,...
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Quantum percolation in cuprate high-temperature superconductors.

J C Phillips1

  • 1Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854-8019, USA. jcphillips8@comcast.net

Proceedings of the National Academy of Sciences of the United States of America
|July 16, 2008
PubMed
Summary

Electron-phonon interactions drive high-temperature superconductivity in cuprates. Analyzing scanning tunneling microscopy data with the dopant-assisted quantum percolation model may reveal quantum pathways despite material complexities.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Cuprate superconductivity, occurring near 100 K, is attributed to electron-phonon interactions.
  • Complex atomic structures in cuprates hinder experimental and theoretical analysis of superconductivity mechanisms.
  • High-resolution techniques like ARPES and STM yield rich but challenging data.

Purpose of the Study:

  • To analyze recent scanning tunneling microscopy (STM) data within the framework of the dopant-assisted quantum percolation (DAQP) model.
  • To explore the potential of the DAQP model in understanding cuprate superconductivity.
  • To identify quantum percolative paths in cuprate materials.

Main Methods:

  • Theoretical analysis based on the dopant-assisted quantum percolation (DAQP) model, originally proposed in 1989.
  • Application of the DAQP model to interpret recent high-resolution, large-area scanning tunneling microscopy (STM) data.
  • Improved data analysis techniques to overcome experimental and theoretical challenges.

Main Results:

  • The study applies the established DAQP model to recent STM data from cuprate materials.
  • The analysis acknowledges the difficulties posed by the complex atomic arrangements in these superconductors.
  • Potential for identifying quantum percolative paths through enhanced data analysis is suggested.

Conclusions:

  • Despite complexities, the dopant-assisted quantum percolation (DAQP) model offers a viable framework for understanding cuprate superconductivity.
  • Improved analysis of STM data may enable the identification of quantum percolative pathways.
  • Electron-phonon interactions and quantum percolation are key to high-T(c) superconductivity in cuprates.