Superlattice formation in group IV-B transition metal dichalcogenides
Woo, Ka-Chiu Eddie
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https://hdl.handle.net/2142/25581
Description
Title
Superlattice formation in group IV-B transition metal dichalcogenides
Author(s)
Woo, Ka-Chiu Eddie
Issue Date
1978
Doctoral Committee Chair(s)
Brown, Frederick C.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
supperlattice formation
group IV-B transition metal dichalocogenides
electron diffraction studies
far-infrared lattice mode
Language
en
Abstract
Electron diffraction studies show that a 2ao x 2co super1attice
forms in TiSe2 at low temperature. Strong diffuse scattering is observed above T. An optically active far-infrared lattice mode is observed which
c breaks up into several additional modes below the phase transition. In the infrared study, there is a dramatic shift in the Drude edge as well as new absorption peaks at low temperature. These observed phenomena are related to the energy gap which opens up in the band structure below the phase transition temperature. Strong diffuse scattering, which persists down to lOOK, is seen in TiS and HfTe2. No structural transition is observed in these crystals,
2 2but the diffuse scattering may be a precursor to super1attice formation.
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