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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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.
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Electronic structure and electron-phonon coupling in TiH2.

K V Shanavas1, L Lindsay1, D S Parker1

  • 1Materials Science &Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6056, USA.

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|June 16, 2016
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Summary
This summary is machine-generated.

First-principles calculations reveal that cubic titanium dihydride (TiH2) exhibits superconductivity due to electronic structure and electron-phonon coupling. Constraining lattice constants stabilizes the cubic phase, crucial for understanding TiH2 superconductivity.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Physics

Background:

  • Titanium dihydride (TiH2) is a material with potential superconducting properties.
  • Understanding the factors influencing its electronic structure and superconductivity is crucial for materials design.

Purpose of the Study:

  • To investigate the electronic structure and superconductivity in cubic and tetragonal TiH2.
  • To elucidate the mechanisms behind the structural instability and superconductivity in TiH2.

Main Methods:

  • First principles calculations
  • Strong coupling theory
  • Phonon dispersion calculations

Main Results:

  • Calculations identified Ti-t2g states as key to a large electronic density of states at the Fermi level in cubic TiH2.
  • Structural instability towards tetragonal distortion was observed but could be suppressed by constraining lattice constants, stabilizing the cubic phase.
  • Decoupled acoustic and optic phonon modes were found, with high frequencies for optic modes.
  • A significant electron-phonon coupling parameter (λ) and a critical temperature of several Kelvin were calculated for the cubic phase.
  • The hydrogen sublattice contribution to λ was found to be small, attributed to low H-s density of states at the Fermi level and high hydrogen mode energies.

Conclusions:

  • The cubic phase of TiH2 is stable at low temperatures under specific conditions and exhibits superconductivity.
  • Electron-phonon coupling, primarily driven by titanium states, is the key mechanism for superconductivity in TiH2.
  • The hydrogen sublattice plays a minor role in the observed superconductivity.