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2016 ; 6
(ä): 28102
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Electronic structure and electron-phonon coupling in TiH2
#MMPMID27302645
Shanavas KV
; Lindsay L
; Parker DS
Sci Rep
2016[Jun]; 6
(ä): 28102
PMID27302645
show ga
Calculations using first principles methods and strong coupling theory are
carried out to understand the electronic structure and superconductivity in cubic
and tetragonal TiH2. A large electronic density of states at the Fermi level in
the cubic phase arises from Ti-t2g states and leads to a structural instability
towards tetragonal distortion at low temperatures. However, constraining the
in-plane lattice constants diminishes the energy gain associated with the
tetragonal distortion, allowing the cubic phase to be stable at low temperatures.
Calculated phonon dispersions show decoupled acoustic and optic modes arising
from Ti and H vibrations, respectively, and frequencies of optic modes to be
rather high. The cubic phase has a large electron-phonon coupling parameter ? and
critical temperature of several K. Contribution of the hydrogen sublattice to ?
is found to be small in this material, which we understand from strong coupling
theory to be due to the small H-s DOS at the Fermi level and high energy of
hydrogen modes at the tetrahedral sites.