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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Ferromagnetism01:31

Ferromagnetism

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Related Experiment Video

Updated: Jun 3, 2026

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

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Incommensurate spin fluctuations in hole-overdoped superconductor KFe2As2.

C H Lee1, K Kihou, H Kawano-Furukawa

  • 1National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.

Physical Review Letters
|March 17, 2011
PubMed
Summary

Heavily hole-overdoped KFe2As2 superconductors exhibit unique incommensurate spin fluctuations. These findings suggest spin fluctuations are more robust in hole-doped than electron-doped iron-based superconductors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Iron-based superconductors (IBS) are a prominent class of quantum materials.
  • Understanding the interplay between magnetism and superconductivity in IBS is crucial.
  • Hole-doping effects on spin fluctuations in IBS remain an active area of research.

Purpose of the Study:

  • To investigate the nature of spin fluctuations in heavily hole-overdoped superconducting KFe2As2.
  • To compare spin fluctuation characteristics with electron-doped IBS.
  • To elucidate the microscopic origins of observed spin fluctuations.

Main Methods:

  • Neutron scattering experiments were performed on KFe2As2.
  • Band structure calculations were conducted to support experimental findings.

Main Results:

  • A well-defined low-energy incommensurate spin fluctuation was observed at [π(1 ± 2 δ),0] with δ = 0.16.
  • The incommensurate structure and peak splitting direction differ from those in electron-doped IBS.
  • Interband scattering between specific bands was identified as the likely origin of the incommensurate peak.

Conclusions:

  • Spin fluctuations are more robust in hole-doped than in electron-doped IBS.
  • The observed spin fluctuation characteristics are linked to the multiorbital band structure.
  • Enhanced spin fluctuation robustness may explain superconductivity in heavily hole-doped samples.