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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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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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Valence Bond Theory

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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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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Superconductivity in KCa2Fe4As4F2 with Separate Double Fe2As2 Layers.

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
Summary
This summary is machine-generated.

Researchers synthesized a new iron arsenide fluoride, KCa2Fe4As4F2, exhibiting bulk superconductivity at 33 Kelvin. This discovery advances the field of novel superconducting materials.

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Condensed Matter Physics

Background:

  • Quinary iron arsenide fluorides represent a class of materials with potential for unique electronic properties.
  • Understanding the relationship between crystal structure and physical properties is crucial for discovering new superconductors.

Purpose of the Study:

  • To synthesize and characterize a novel quinary iron arsenide fluoride, KCa2Fe4As4F2.
  • To investigate the crystal structure and physical properties, including superconductivity, of this new compound.

Main Methods:

  • Single crystal X-ray diffraction for crystal structure determination.
  • Measurements of electrical resistivity, magnetic susceptibility, and heat capacity to probe physical properties.

Main Results:

  • KCa2Fe4As4F2 crystallizes in a body-centered tetragonal lattice (space group I4/mmm).
  • The structure features double Fe2As2 conducting layers separated by insulating Ca2F2 layers.
  • Bulk superconductivity was observed at a critical temperature of 33 K.

Conclusions:

  • The newly synthesized KCa2Fe4As4F2 is a superconductor with potential for further research.
  • The layered structure likely plays a significant role in its superconducting behavior.
  • This finding contributes to the ongoing exploration of high-temperature superconductivity in iron-based materials.