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Related Concept Videos

Types Of Superconductors01:28

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...
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...
Ferromagnetism01:31

Ferromagnetism

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Colors and Magnetism03:02

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Color in Coordination Complexes
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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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Related Experiment Video

Updated: Jul 12, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

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The Axial Oxygen Atom and Superconductivity in YBa2Cu3O7.

S D Conradson, I D Raistrick

    Science (New York, N.Y.)
    |March 10, 1989
    PubMed
    Summary

    Superconductivity in Yttrium Barium Copper Oxide (YBa2Cu3O7) is linked to changes in copper-oxygen bonds. These lattice dynamics suggest an excitonic pairing mechanism is responsible for high transition temperatures.

    Area of Science:

    • Materials Science
    • Condensed Matter Physics
    • Solid-State Chemistry

    Background:

    • Yttrium Barium Copper Oxide (YBa2Cu3O7) is a high-temperature superconductor.
    • Understanding the relationship between lattice dynamics and superconductivity is crucial for developing new superconducting materials.

    Purpose of the Study:

    • To investigate the changes in the copper K-edge x-ray absorption spectrum of YBa2Cu3O7 at its critical temperature.
    • To correlate observed spectral changes with lattice dynamics and electronic structure modifications during the superconducting transition.

    Main Methods:

    • X-ray absorption spectroscopy (XAS) at the copper K-edge.
    • Analysis of spectral changes across the superconducting critical temperature.

    Main Results:

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    Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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    • Observed changes in the XAS spectrum indicate a decrease in the mean square relative displacement of Cu2-O4 bonds, suggesting increased harmonicity.
    • A slight increase in the Cu1-O4 distance and a shift towards more atomic-like electronic states were noted.
    • These structural and electronic changes are associated with the superconducting transition.

    Conclusions:

    • The bridging axial oxygen atom plays a critical role in the high transition temperature of YBa2Cu3O7.
    • The observed lattice instability and its effect on the copper-oxygen sublattice are consistent with an excitonic pairing mechanism for superconductivity.