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Related Concept Videos

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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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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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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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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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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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Nematic Correlation Length in Iron-Based Superconductors Probed by Inelastic X-Ray Scattering.

A M Merritt1, F Weber2,3, J-P Castellan2,4

  • 1Department of Physics, University of Colorado at Boulder, Boulder, Colorado 80309, USA.

Physical Review Letters
|May 2, 2020
PubMed
Summary
This summary is machine-generated.

Nematicity, a common feature in high-temperature superconductors, was studied in iron-based systems. Researchers found the nematic correlation length follows a power law, indicating a mean-field transition potentially harming superconductivity.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Nematicity is prevalent in high-temperature superconductors, especially iron-based compounds.
  • Understanding nematicity's role is crucial for advancing superconductor technology.

Purpose of the Study:

  • To investigate the temperature dependence of the nematic correlation length (ξ) in FeSe and cobalt-doped BaFe2As2.
  • To characterize the nature of the nematic transition in these materials.

Main Methods:

  • Inelastic X-ray scattering was employed to measure acoustic phonon mode anomalies.
  • The nematic correlation length (ξ) was extracted from phonon softening.
  • Data analysis involved fitting to power-law and Curie-Weiss behaviors.

Main Results:

  • The nematic correlation length (ξ) in FeSe and doped BaFe2As2 systems exhibited a power-law dependence (T-T0)-1/2 over a broad temperature range.
  • These findings align with Curie-Weiss behavior observed in nematic susceptibility.
  • A significant nematoelastic coupling was identified.

Conclusions:

  • The nematic transition in these iron-based superconductors displays characteristics of mean-field behavior.
  • The identified nematoelastic coupling is likely detrimental to the superconducting properties of these materials.