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Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
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 Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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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...
Spin–Spin Coupling: One-Bond Coupling01:17

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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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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Strain-induced spin states in atomically ordered cobaltites.

Woo Seok Choi1, Ji-Hwan Kwon, Hyoungjeen Jeen

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

Nano Letters
|August 15, 2012
PubMed
Summary
This summary is machine-generated.

Epitaxial strain in LaCoO(3) thin films induces ferromagnetism via novel stripe-like patterns. This research clarifies the exotic magnetism in strained oxide films, enabling property tuning.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Epitaxial strain in complex oxide thin films is crucial for discovering new material properties.
  • Lanthanum cobalt oxide (LaCoO(3)) is nonmagnetic in bulk but exhibits ferromagnetism in thin films, a phenomenon poorly understood.
  • Understanding this strain-induced magnetism is key to advanced materials design.

Purpose of the Study:

  • To investigate the mechanism behind the ferromagnetism in epitaxially strained LaCoO(3) thin films.
  • To elucidate the role of strain relaxation on the magnetic properties of LaCoO(3).
  • To explore novel routes for tailoring the properties of functional oxide heterostructures.

Main Methods:

  • Utilized scanning transmission electron microscopy (STEM) to analyze thin film structure.
  • Employed X-ray and optical spectroscopy to probe electronic and magnetic states.
  • Studied LaCoO(3) epitaxial thin films under varying strain conditions.

Main Results:

  • Observed unconventional strain relaxation forming stripe-like, lattice-modulated patterns without defects.
  • Identified ferromagnetic ordering within these modulated sheets, attributed to intermediate or high spin Co(3+).
  • Provided a clear explanation for the exotic magnetism in strained LaCoO(3) films.

Conclusions:

  • Strain engineering in LaCoO(3) thin films leads to stripe-like magnetic ordering.
  • This discovery offers a new method for controlling electronic and magnetic properties in oxide heterostructures.
  • The findings pave the way for designing novel functional materials with tailored magnetic behaviors.