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Dimerization in α-TiCl3and α-TiBr3: the DFT study.

Vladimir V Gapontsev1, Daria D Gazizova1, Sergey V Streltsov1,2

  • 1M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620137, Ekaterinburg, Russia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 17, 2021
PubMed
Summary
This summary is machine-generated.

Density Functional Theory (DFT) calculations reveal that honeycomb lattice titanates, specifically α-TiCl₃ and α-TiBr₃, do not support the proposed SU(4) spin-orbital model due to dimerization. This dimerization explains the observed drop in magnetic susceptibility and suggests a valence-bond liquid state at high temperatures.

Keywords:
dimerizationmagnetic propertiesmolecular orbitals

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Chemistry

Background:

  • Layered titanates with honeycomb lattices are of interest for exploring exotic electronic and magnetic properties.
  • The proposed SU(4) spin-orbital model aimed to describe d¹ systems in such lattices.
  • Experimental observations of magnetic susceptibility drops in α-TiBr₃ required theoretical explanation.

Purpose of the Study:

  • To investigate the electronic and magnetic properties of α-TiCl₃ and α-TiBr₃ using DFT.
  • To determine the validity of the symmetric SU(4) spin-orbital model for these titanates.
  • To elucidate the mechanisms behind the experimentally observed magnetic behavior.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.
  • The electronic structure and magnetic interactions of layered α-TiCl₃ and α-TiBr₃ were simulated.
  • Low and high-temperature phases were theoretically modeled.

Main Results:

  • DFT calculations indicate that α-TiCl₃ and α-TiBr₃ undergo dimerization in the low-temperature phase.
  • This dimerization prevents the realization of the symmetric SU(4) spin-orbital model.
  • The dimerization phenomenon explains the experimentally observed decrease in magnetic susceptibility for α-TiBr₃.
  • Evidence suggests the formation of a valence-bond liquid state in the high-temperature phase of both compounds.

Conclusions:

  • The symmetric SU(4) spin-orbital model is not applicable to the studied titanates due to low-temperature dimerization.
  • Dimerization in α-TiCl₃ and α-TiBr₃ is the key factor explaining their magnetic properties.
  • A valence-bond liquid state is proposed for the high-temperature phase, offering new avenues for research.