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oai:www.ideals.illinois.edu:2142/77204 2023-07-11 col_2142_5131 col_2142_8859 com_2142_5130 com_2142_8858 com_2142_234

http://hdl.handle.net/2142/77204 U of I Only 120 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1981. Delong, Bancherd 2015-05-13T15:22:27Z 2015-05-13T15:22:27Z 10000-01-01 1981 1981 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. Made available in DSpace on 2015-05-13T15:22:27Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8127579.PDF: 3481806 bytes, checksum: 8d30bbeaafef32a29b4f7a6f5b5eedcf (MD5) Previous issue date: 1981 Embargo set by: Seth Robbins for item 78415 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs (UMI)AAI8127579 eng Physics, Condensed Matter Energy Bands and Superlattice Formation in Titanium Diselenide text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.