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Videos de Conceptos Relacionados

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

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...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...

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Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Density functional theory calculations of UO2 oxidation: evolution of UO(2+x), U4O(9-y), U3O7, and U3O8.

Inorganic chemistry·2013
Same author

Stability and migration of large oxygen clusters in UO(2+x): density functional theory calculations.

The Journal of chemical physics·2012
Same author

Local structure fluctuations as a signature of an inhomogeneous ground state in high-Tc superconductors.

Journal of synchrotron radiation·2005
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Human nucleotide excision repair protein XPA: extended X-ray absorption fine-structure evidence for a metal-binding domain.

Protein science : a publication of the Protein Society·1998
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Selenol binds to iron in nitrogenase iron-molybdenum cofactor: an extended x-ray absorption fine structure study.

Proceedings of the National Academy of Sciences of the United States of America·1994
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High-Temperature XAS Study of Fe2SiO4 Liquid: Reduced Coordination of Ferrous Iron.

Science (New York, N.Y.)·1993

Video Experimental Relacionado

Updated: Jul 12, 2026

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

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

Published on: March 24, 2019

El átomo de oxígeno axial y la superconductividad en YBa2Cu3O7

S D Conradson, I D Raistrick

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

    La superconductividad en el óxido de cobre de yttrio bario (YBa2Cu3O7) está relacionada con cambios en los enlaces cobre-oxígeno. Estas dinámicas de celosía sugieren que un mecanismo de emparejamiento excitónico es responsable de altas temperaturas de transición.

    Área de la Ciencia:

    • Ciencia de los materiales Ciencia de los materiales.
    • Física de la materia condensada Física de la materia condensada
    • Química del estado sólido.

    Sus antecedentes:

    • El óxido de cobre de bario yttrio (YBa2Cu3O7) es un superconductor de alta temperatura.
    • Comprender la relación entre la dinámica de la red y la superconductividad es crucial para el desarrollo de nuevos materiales superconductores.

    Objetivo del estudio:

    • Para investigar los cambios en el espectro de absorción de rayos X de borde K de cobre de YBa2Cu3O7 a su temperatura crítica.
    • Para correlacionar los cambios espectrales observados con la dinámica de la red y las modificaciones de la estructura electrónica durante la transición superconductora.

    Principales métodos:

    • Espectroscopia de absorción de rayos X (XAS) en el borde K de cobre.
    • Análisis de los cambios espectrales a través de la temperatura crítica superconductora.

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    Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
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    Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

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    Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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    Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

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    Videos de Experimentos Relacionados

    Last Updated: Jul 12, 2026

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

    Published on: March 24, 2019

    Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
    06:49

    Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

    Published on: April 12, 2019

    Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
    04:51

    Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

    Published on: July 8, 2021

    Principales resultados:

    • Los cambios observados en el espectro XAS indican una disminución en el desplazamiento relativo cuadrado medio de los enlaces Cu2-O4, lo que sugiere una mayor armonicidad.
    • Se observó un ligero aumento en la distancia Cu1-O4 y un cambio hacia estados electrónicos más parecidos a los atómicos.
    • Estos cambios estructurales y electrónicos están asociados con la transición superconductora.

    Conclusiones:

    • El átomo de oxígeno axial de puente juega un papel crítico en la alta temperatura de transición de YBa2Cu3O7.
    • La inestabilidad de la red observada y su efecto en la subred de cobre-oxígeno son consistentes con un mecanismo de emparejamiento excitónico para la superconductividad.