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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...
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Updated: May 29, 2026

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Published on: July 20, 2022

Crystallography-driven molecularization of a two-dimensional spin-3/2magnet.

Hari Borutta1, Tobias Müller2, Ronny Thomale1,2

  • 1Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.

Reports on Progress in Physics. Physical Society (Great Britain)
|May 27, 2026
PubMed
Summary

Large-spin two-dimensional magnets can avoid magnetic ordering due to their crystal structure. This study reveals how Na2Mn3O7 exhibits two magnetic crossover scales, leading to a quantum disordered state.

Keywords:
density functional theoryfrustrated magnetismmaple-leaf latticemolecular magnetismpseudo-fermion functional renormalization group

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Magnetism

Background:

  • Large-spin 2D magnets typically exhibit long-range magnetic order.
  • The compound Na2Mn3O7, a layered spin-3/2 magnet, unexpectedly shows no magnetic ordering.

Purpose of the Study:

  • To investigate the origin of the unusual magnetic behavior in Na2Mn3O7.
  • To understand the role of crystallographic structure in magnetic ordering.

Main Methods:

  • Theoretical analysis of magnetic interactions.
  • Examination of crystallographic structure and its impact on magnetic pathways.
  • Thermodynamic modeling of magnetic correlations.

Main Results:

  • Crystallographic inequivalence in Na2Mn3O7 leads to molecularized magnetic degrees of freedom.
  • Antiferromagnetic hexagons are nearly isolated by inequivalent exchange pathways.
  • Magnetic correlations develop in two stages: intra-hexagon and inter-hexagon.
  • The quantum ground state is magnetically disordered with strong intra-hexagon correlations.

Conclusions:

  • Crystallographic inequivalence is a key mechanism for stabilizing molecularized and quantum-disordered states in 2D magnets.
  • Na2Mn3O7 provides a novel example defying conventional magnetic ordering expectations.
  • The study highlights the interplay between crystal structure and quantum magnetism.