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

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Ferromagnetism

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Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
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CFT focuses on...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Published on: June 7, 2018

Nonconventional spin glass transition in a chemically ordered pyrochlore.

D K Singh1, Y S Lee

  • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. dsingh@nist.gov

Physical Review Letters
|February 2, 2013
PubMed
Summary

This study reveals unusual spin glass properties in terbium molybdate pyrochlores. Short-range ferromagnetic interactions and spin dynamics influence the freezing behavior below the glass transition temperature.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Geometrically frustrated pyrochlores exhibit complex magnetic behaviors.
  • Terbium Molybdate (Tb2Mo2O7) is a pyrochlore material with potential spin glass properties.

Purpose of the Study:

  • To investigate the unusual spin glass properties of Tb2Mo2O7.
  • To understand the role of short-range ferromagnetic interactions and spin dynamics in the freezing behavior.

Main Methods:

  • Analysis of nonlinear direct current (dc) and complex magnetic susceptibilities.
  • Study of the glass transition regime near 24 K.

Main Results:

  • Observed a statistical distribution of relaxation times in short-range ordered ferromagnetic clusters.
  • Found that magnetic spins are not fully frozen below the glass transition temperature.
  • Identified nonequilibrium scaling behavior in static critical exponents of nonlinear susceptibilities.

Conclusions:

  • The findings shed light on the freezing properties of frustrated pyrochlores.
  • Short-range ferromagnetic interactions significantly impact spin glass behavior in Tb2Mo2O7.
  • Further understanding of spin dynamics is crucial for characterizing these materials.