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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.
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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:
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Crystal Field Theory
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  3. Correlation-driven Topological Transition In Janus Two-dimensional Vanadates.
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  3. Correlation-driven Topological Transition In Janus Two-dimensional Vanadates.

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Correlation-Driven Topological Transition in Janus Two-Dimensional Vanadates.

Ghulam Hussain1, Amar Fakhredine2, Rajibul Islam1

  • 1International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02668 Warsaw, Poland.

Materials (Basel, Switzerland)
|February 25, 2023

View abstract on PubMed

Summary
This summary is machine-generated.

Intrinsic ferromagnetism in 2D materials like VSi2Z4 is explored. Researchers found robust magnetic ordering and correlation-driven topological transitions, paving the way for novel spintronic and topological devices.

Keywords:
2D ferromagnetismcorrelation-driven topological transitiondensity functional theoryvanadates

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Chemistry

Background:

  • Two-dimensional (2D) materials with intrinsic ferromagnetism offer unique platforms for exploring magnetism-topology interplay.
  • Magnetic anisotropy energy (MAE) is crucial for nanoscale magnetic applications.

Purpose of the Study:

  • Investigate electronic band structures and strain-dependent MAE in VSi2Z4 (Z=P, As) and its Janus phase VSiGeP2As2.
  • Explore the evolution of topology with Coulomb interaction.
  • Analyze the piezoelectric properties of the Janus phase.

Main Methods:

  • First-principles calculations.
  • Analysis of electronic band structures.
  • Investigation of magnetic anisotropy energy (MAE) under strain.
  • Study of topological transitions as a function of Coulomb interaction.

    • Main Results:

    • All three monolayers (VSi2P4, VSi2As4, VSiGeP2As2) exhibit robust ferromagnetic ground states, stable under biaxial strain.
    • Out-of-plane magnetization observed in VSi2P4, in-plane in VSi2As4 and VSiGeP2As2.
    • Janus VSiGeP2As2 displays broken mirror symmetry, indicating piezoelectricity.
    • A correlation-driven topological transition was observed in Janus VSiGeP2As2.
    • Large coupling J and magnetocrystalline anisotropy suggest a high critical temperature.

    Conclusions:

    • Pristine and Janus VSi2Z4 materials are promising candidates for 2D spintronics.
    • These materials enable the study of the interplay between magnetism and topology in 2D systems.
    • The findings open new avenues for designing next-generation electronic and magnetic devices.