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Author Claessen, R. ♦ Anderson, R. O. ♦ Gweon, G. ♦ Allen, J. W. ♦ Ellis, W. P. ♦ Janowitz, C. ♦ Olson, C. G. ♦ Shen, Z. X. ♦ Eyert, V. ♦ Skibowski, M. ♦ Friemelt, K. ♦ Bucher, E. ♦ Huefner, S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ TITANIUM TELLURIDES ♦ ELECTRONIC STRUCTURE ♦ SEMIMETALS ♦ PHOTOELECTRON SPECTROSCOPY ♦ ONE-DIMENSIONAL CALCULATIONS ♦ FERMI LEVEL ♦ QUASI PARTICLES ♦ LAYERED MATERIALS ♦ ANGULAR RESOLUTION ♦ DENSITY FUNCTIONAL METHOD
Abstract The electronic structure of the layered compound 1{ital T}-TiTe{sub 2} has been studied in detail by high-resolution angle-resolved photoelectron spectroscopy (ARPES) and density-functional band calculations. The results confirm the semimetallic nature of this material as due to an overlap of Te 5{ital p}- and Ti 3{ital d}-like conduction bands. We find an overall good correspondence between experiment and theory, with all ARPES structures accounted for by the calculated band structure. Particular focus is applied to the bands near the Fermi level and to the Fermi-surface topology. Interesting behavior is observed for an essentially Ti 3{ital d}{sup 2}{sub {ital Z}}-derived conduction band, whose measured Fermi vector and qualitative shape are excellently reproduced by the calculation. However, the experimental energy dispersion of the Ti 3{ital d}{sub {ital z}{sup 2}} ARPES peak appears to be considerably reduced with respect to band theory. From these results we obtain a picture of the electronic structure of 1{ital T}-TiTe{sub 2} as that of a Fermi liquid with renormalized quasiparticle dispersions and a Fermi surface in accordance with Luttinger{close_quote}s sumrule. We show that the experimental Ti 3{ital d}{sub {ital z}{sup 2}} emission is quasi-two-dimensional near the Fermi surface, which, together with its being remarkably unobscured, virtually free of any interference with other spectral structures or inelastic background, makes it an ideal object for ARPES line-shape studies on a Fermi-liquid system. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-07-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 4


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