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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...
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.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
Properties of Transition Metals02:58

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Dimensionality driven spin-flop transition in layered iridates.

J W Kim1, Y Choi, Jungho Kim

  • 1Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.

Physical Review Letters
|August 7, 2012
PubMed
Summary
This summary is machine-generated.

Researchers discovered a distinct antiferromagnetic structure in bilayer Sr3Ir2O7, contrasting with single-layer Sr2IrO4. This finding is driven by competing interactions in spin-orbit entangled moments, explaining unconventional magnetism in 5d transition metal oxides.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Magnetism

Background:

  • Single-layer Sr2IrO4 exhibits in-plane canted antiferromagnetic moments.
  • Bilayer Sr3Ir2O7 is a Mott insulator in the strong spin-orbit coupling regime.
  • Understanding anisotropic exchange interactions is crucial for novel magnetic phenomena.

Purpose of the Study:

  • To determine the magnetic structure of bilayer Sr3Ir2O7.
  • To elucidate the origin of anisotropic exchange interactions in 5d transition metal oxides.
  • To explain the spin-flop transition observed with varying IrO2 layers.

Main Methods:

  • Resonant x-ray diffraction was employed to probe the magnetic structure.
  • A microscopic model Hamiltonian was developed to analyze interactions.
  • Theoretical modeling was used to explain experimental observations.

Main Results:

  • An easy c-axis collinear antiferromagnetic structure was observed in bilayer Sr3Ir2O7.
  • A spin-flop transition was identified as a function of the number of IrO2 layers.
  • The transition is attributed to competing intra- and interlayer pseudodipolar interactions.

Conclusions:

  • The study reveals the origin of anisotropic exchange interactions in Sr3Ir2O7.
  • The findings provide insight into unconventional magnetism in 5d transition metal oxides.
  • The observed magnetic structure contrasts with that of single-layer iridates.