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Videos de Conceptos Relacionados

Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Properties of Transition Metals02:58

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
Metallic Solids02:37

Metallic Solids

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 malleability. Many...
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.
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...

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Published on: June 28, 2018

Materiales aislantes topológicos actinídeos con fuerte interacción.

Xiao Zhang1, Haijun Zhang, Jing Wang

  • 1Department of Physics, Stanford University, Stanford, CA 94305, USA.

Science (New York, N.Y.)
|March 24, 2012
PubMed
Resumen

Predicimos una nueva clase de aislantes topológicos impulsados por las interacciones de electrones en compuestos actínidos. Estos materiales podrían permitir nuevas aplicaciones e investigación fundamental en la física de la materia condensada.

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Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada
  • Ciencia de los materiales ciencia de los materiales.

Sus antecedentes:

  • Los aislantes de banda topológica son conocidos en sistemas acoplados de órbita de espín.
  • Los efectos de interacción son cruciales para las nuevas fases topológicas.

Objetivo del estudio:

  • Para predecir teóricamente una nueva clase de aislantes topológicos.
  • Para explorar las fases topológicas impulsadas por la interacción en los compuestos actínidos.

Principales métodos:

  • Predicción teórica de las fases topológicas.
  • Investigando las transiciones de fase cuántica en los materiales.

Principales resultados:

  • Descubrió la transición de fase cuántica impulsada por la interacción a una fase de aislante topológico.
  • Se han identificado compuestos actínidos (Pu y Am) como posibles candidatos.
  • Predijo un solo cono de Dirac en la superficie de estos aislantes topológicos.

Conclusiones:

  • Los aislantes topológicos basados en actinuros ofrecen una plataforma única para la investigación.
  • Estos materiales podrían servir de puente entre la ciencia fundamental y las aplicaciones prácticas.