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Related Concept Videos

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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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Color in Coordination Complexes
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Crystal Field Theory
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Tetrahedral Complexes
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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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Updated: Apr 18, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Field-tunable spin-density-wave phases in Sr3Ru2O7.

C Lester1, S Ramos2, R S Perry3

  • 1H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK.

Nature Materials
|January 13, 2015
PubMed
Summary
This summary is machine-generated.

A magnetic field can induce spin-density-wave (SDW) magnetic order in the metamagnetic metal Sr3Ru2O7. This field-induced order, observed using neutron scattering, offers insights into electronic fine structure and resistivity anisotropy.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Conduction electrons in metals exhibit complex interactions with nuclei and each other, leading to various magnetic ordering phenomena.
  • Spin-density-wave (SDW) antiferromagnetism is one such emergent magnetic state observed in materials like chromium.
  • Metamagnetic materials possess delicately balanced electronic interactions sensitive to external perturbations.

Purpose of the Study:

  • To investigate the effect of a magnetic field on the electronic and magnetic properties of the quasi-2D metamagnetic metal Sr3Ru2O7.
  • To determine if a magnetic field can induce magnetic order in Sr3Ru2O7 in the absence of intrinsic magnetic ordering.
  • To elucidate the mechanism behind field-induced magnetic order and its relation to electronic fine structure and anisotropic behavior.

Main Methods:

  • Magnetic neutron scattering was employed to probe the magnetic structure and ordering in Sr3Ru2O7.
  • A large magnetic field (approximately 8 Tesla) was applied to the material to induce and study magnetic states.
  • Resistivity measurements were conducted to observe anisotropic behavior potentially linked to magnetic ordering.

Main Results:

  • Application of a large magnetic field (B ≈ 8 T) successfully induced two distinct spin-density-wave (SDW) magnetic ordered states in Sr3Ru2O7.
  • These field-induced SDW states were observed to exist over narrow magnetic field ranges (≲0.4 T).
  • The direction of the applied magnetic field was found to control the population of SDW domains, correlating with observed resistivity anisotropy or 'electronic nematic' behavior.

Conclusions:

  • A magnetic field can be a powerful tool to tune and induce novel magnetic states, such as SDW order, in metamagnetic materials.
  • The field-induced SDW states in Sr3Ru2O7 likely arise from a mechanism related to the electronic fine structure near the Fermi energy, possibly enhanced by magnetic fluctuations.
  • The control of SDW domain populations by magnetic field direction provides a direct explanation for the electronic nematic behavior observed in this material.