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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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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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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...
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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.
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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.
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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...
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Superconductividad en KCa2Fe4As4F2 con capas dobles separadas de Fe2As2

Zhi-Cheng Wang1, Chao-Yang He1, Si-Qi Wu1

  • 1Department of Physics and State Key Lab of Silicon Materials, Zhejiang University , Hangzhou 310027, China.

Journal of the American Chemical Society
|June 21, 2016
PubMed
Resumen

Los investigadores sintetizaron un nuevo fluoruro de arseniuro de hierro, KCa2Fe4As4F2, que exhibe una superconductividad a granel a 33 Kelvin. Este descubrimiento avanza en el campo de los nuevos materiales superconductores.

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Área de la Ciencia:

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

Sus antecedentes:

  • Los fluoruros quinarios de arseniuro de hierro representan una clase de materiales con potencial para propiedades electrónicas únicas.
  • Comprender la relación entre la estructura cristalina y las propiedades físicas es crucial para descubrir nuevos superconductores.

Objetivo del estudio:

  • Para sintetizar y caracterizar un nuevo fluoruro de arseniuro de hierro quinario, KCa2Fe4As4F2.
  • Investigar la estructura cristalina y las propiedades físicas, incluyendo la superconductividad, de este nuevo compuesto.

Principales métodos:

  • Difracción de rayos X de un solo cristal para la determinación de la estructura cristalina.
  • Medidas de la resistividad eléctrica, la susceptibilidad magnética y la capacidad térmica para sondear las propiedades físicas.

Principales resultados:

  • KCa2Fe4As4F2 se cristaliza en una red tetragonal centrada en el cuerpo (grupo espacial I4 / mm).
  • La estructura presenta dos capas conductoras de Fe2As2 separadas por capas aislantes de Ca2F2.
  • Se observó superconductividad a granel a una temperatura crítica de 33 K.

Conclusiones:

  • El recién sintetizado KCa2Fe4As4F2 es un superconductor con potencial para futuras investigaciones.
  • La estructura en capas probablemente juega un papel importante en su comportamiento superconductor.
  • Este hallazgo contribuye a la exploración en curso de la superconductividad a alta temperatura en materiales a base de hierro.