Energy Bands and Superlattice Formation in Titanium Diselenide
Delong, Bancherd
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https://hdl.handle.net/2142/77204
Description
Title
Energy Bands and Superlattice Formation in Titanium Diselenide
Author(s)
Delong, Bancherd
Issue Date
1981
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
The superlattice formation in TiSe(,2) is related to a soft phonon mode near the zone boundary. This mode is supported by a coupling of the electrons at L and the holes at (GAMMA), which causes an anomalously large electronic susceptibility. When the transition occurs, a large portion of the Fermi surface gaps, new electronic states and energy-bands are formed, resulting in the lowering of the electronic energy. The 2a(,o) x 2a(,o) superlattice was directly observed by electron diffraction in dilute Zr-doped TiSe(,2) crystals. The phase transition is critically suppressed in the range 14-15% of Zr. The powerful technique of angle-resolved photoemission spectroscopy has been extended to low temperature. Changes in the energy band structure of TiSe(,2) due to superlattice formation were observed for the first time.
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