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Some materials may easily let electrical charges pass through them, while others obstruct their flow. The former are called conductors and the latter insulators. The atomic structures of materials determine whether they are conductors or insulators of electricity.
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Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Transición de aislante metálico isostructural en VO2

D Lee1, B Chung2, Y Shi3

  • 1Department of Materials Science and Engineering, University of Wisconsin, Madison, WI 53706, USA.

Science (New York, N.Y.)
|December 1, 2018
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Resumen

Los investigadores lograron una transición isostructural de aislantes metálicos en heterostructuras de dióxido de vanadio, impulsadas puramente por interacciones electrónicas en las interfaces. Esto evita los cambios estructurales, ofreciendo nuevas posibilidades para el diseño de dispositivos electrónicos.

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Área de la Ciencia:

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

Sus antecedentes:

  • Las transiciones metal-aislante (MIT) en materiales correlacionados están típicamente vinculadas a cambios estructurales.
  • Este acoplamiento complica la comprensión y limita el rendimiento del dispositivo.
  • El dióxido de vanadio (VO2) es un material correlacionado arquetípico que exhibe MIT.

Objetivo del estudio:

  • Para demostrar un MIT isostructural, impulsado electrónicamente en las heteroestructuras VO2.
  • Investigar el papel de las interacciones de interfaz en el control de las correlaciones electrónicas.
  • Explorar el potencial de nuevas funcionalidades de los dispositivos electrónicos.

Principales métodos:

  • Síntesis epitaxial de película delgada de las heteroestructuras de VO2.
  • Características estructurales y eléctricas completas.
  • Primeros principios de modelado teórico y simulaciones.

Principales resultados:

  • Se identificó una interacción de interfaz que suprime las correlaciones electrónicas en VO2.
  • Esta interacción induce una transición metal-aislante sin alterar la estructura cristalina (isostrutural).
  • Se estabilizó una fase metálica de no equilibrio, lo que condujo al MIT isostrutural observado.

Conclusiones:

  • La ingeniería de interfaz puede desacoplar las transiciones electrónicas y estructurales en materiales correlacionados.
  • Este trabajo proporciona una nueva vía para comprender y controlar el MIT.
  • Los hallazgos pueden facilitar el diseño de dispositivos electrónicos avanzados con mayor velocidad y resistencia.