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Related Concept Videos

Ferromagnetism01:31

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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 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...
Spin–Spin Coupling: One-Bond Coupling01:17

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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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Related Experiment Video

Updated: Jun 24, 2026

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

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Fermi surface nesting induced strong pairing in iron-based superconductors.

K Terashima1, Y Sekiba, J H Bowen

  • 1Ultraviolet Synchrotron Orbital Radiation Facility, Institute for Molecular Science, Okazaki 444-8585, Japan. kensei@ims.ac.jp

Proceedings of the National Academy of Sciences of the United States of America
|April 11, 2009
PubMed
Summary
This summary is machine-generated.

High-temperature superconductivity in iron pnictides is linked to Fermi-surface (FS) nesting. Electron doping shifts pairing strength to different FS pockets, supporting inter-FS interactions in unconventional superconductors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • High-temperature superconductivity in iron pnictides suggests unconventional mechanisms.
  • Fermi-surface (FS)-dependent superconducting gaps imply crucial inter-FS interactions.
  • Previous studies in Ba(0.6)K(0.4)Fe(2)As(2) showed pairing strength correlated with FS nesting.

Purpose of the Study:

  • To investigate the relationship between Fermi-surface (FS) nesting and superconducting pairing in electron-doped iron pnictides.
  • To determine if the inter-FS pairing mechanism is prevalent in these materials.

Main Methods:

  • Investigated the electron-doped compound BaFe(1.85)Co(0.15)As(2).
  • Analyzed changes in Fermi-surface (FS) pocket sizes upon electron doping.
  • Measured superconducting pairing strength (2Delta/T(c)) across different FS regions.

Main Results:

  • Electron doping in BaFe(1.85)Co(0.15)As(2) caused a switch in the nesting condition from the alpha to the beta FS.
  • The superconducting pairing strength (2Delta/T(c) approximately 6) was found to switch to the newly nested beta FS.
  • Observed a strong correlation between FS nesting and superconducting pairing strength.

Conclusions:

  • The study confirms an intimate connection between Fermi-surface (FS) nesting and superconducting pairing in iron-based superconductors.
  • The findings strongly support the inter-FS pairing mechanism as a key factor in achieving high-temperature superconductivity in these materials.