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Videos de Conceptos Relacionados

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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
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Superconductor01:24

Superconductor

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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.
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,...
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VSEPR Theory for Determination of Electron Pair Geometries
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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Superconductividad en una capa Ta4Pd3Te16 con cadenas PdTe2.

Wen-He Jiao1, Zhang-Tu Tang, Yun-Lei Sun

  • 1Department of Physics, ‡State Key Lab of Silicon Materials and §Center of Electron Microscope, Zhejiang University , Hangzhou 310027, China.

Journal of the American Chemical Society
|January 17, 2014
PubMed
Resumen

Los investigadores descubrieron superconductividad en el tellururo ternario de baja dimensión Ta4Pd3Te16.16. Se observó superconductividad a granel a 4.6 K, lo que indica importantes interacciones electrón-electrón para el emparejamiento de Cooper.

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Área de la Ciencia:

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

Sus antecedentes:

  • La superconductividad en compuestos de baja dimensión es un área importante de investigación.
  • Los telururos ternales ofrecen propiedades estructurales y electrónicas únicas para explorar nuevos fenómenos superconductores.

Objetivo del estudio:

  • Para investigar las propiedades superconductoras del tellururo ternario de baja dimensión Ta4Pd3Te16.
  • Para caracterizar el mecanismo de superconductividad en este nuevo material.

Principales métodos:

  • Crecimiento cristalino de Ta4Pd3Te16 utilizando un método de autoflujo.
  • Resistividad eléctrica, susceptibilidad magnética y mediciones de calor específico.
  • Análisis de la estructura cristalina, centrándose en las cadenas PdTe2 que comparten los bordes.

Principales resultados:

  • Se confirmó la superconductividad a granel en cristales Ta4Pd3Te16 a una temperatura crítica de 4,6 K.
  • Las mediciones demostraron consistentemente el comportamiento superconductor.
  • Se encontraron evidencias de importantes interacciones electrón-electrón.

Conclusiones:

  • Ta4Pd3Te16 es un nuevo superconductor a granel.
  • La superconductividad observada se atribuye a las interacciones electrón-electrón que permiten el emparejamiento de Cooper.
  • Este descubrimiento abre nuevas vías para la investigación en superconductores de baja dimensión.