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Related Concept Videos

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...
Ferromagnetism01:31

Ferromagnetism

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...
Superconductor01:24

Superconductor

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...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
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Paramagnetism01:30

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Magnetism in Fe-based superconductors.

M D Lumsden1, A D Christianson

  • 1Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. lumsdenmd@ornl.gov

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 12, 2011
PubMed
Summary
This summary is machine-generated.

Magnetism in iron-based superconductors shows similarities to cuprates, with magnetic order suppressed by doping to enable superconductivity. Spin dynamics reveal anisotropic interactions, and a resonance in the superconducting state scales with transition temperature.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Iron-based superconductors share similarities with cuprates, including doping-dependent phase diagrams.
  • Parent compounds exhibit magnetic order and structural transitions suppressed by doping.

Purpose of the Study:

  • To review experimental studies on magnetism in iron-based superconductors.
  • To compare magnetic properties and spin dynamics with cuprates.

Main Methods:

  • Analysis of experimental studies on magnetism in Fe-based superconductors.
  • Examination of doping-dependent phase diagrams.
  • Investigation of spin arrangements and spin dynamics through spin wave analysis.
  • Characterization of resonance in the superconducting state's spin excitation spectrum.

Main Results:

  • Iron-based superconductors display stripe-like spin arrangements distinct from cuprates.
  • Spin dynamics indicate anisotropic three-dimensional interactions with significant next-nearest-neighbor coupling.
  • A resonance in the superconducting state scales with transition temperature (E(r) ∼ 4.9k(B)T(C)) and superconducting gap (E(r)/2Δ ∼ 0.64).

Conclusions:

  • The magnetic and electronic properties of iron-based superconductors are closely linked to superconductivity.
  • Resonance behavior in the superconducting state suggests a common mechanism across unconventional superconductors.
  • Further research into spin dynamics and their relation to superconductivity is warranted.