Complete band-structure determination of the quasi-two-dimensional Fermi-liquid reference compound TiTe{sub 2}

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.2453· OSTI ID:288752

Claessen, R ^[1]; Anderson, R O; Gweon, G; Allen, J W ^[2]; Ellis, W P ^[3]; Janowitz, C; Olson, C G ^[4]; Shen, Z X ^[5]; Eyert, V ^[6]; Skibowski, M ^[7]; Friemelt, K; Bucher, E ^[8]; Huefner, S ^[1]

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1. Fachbereich Experimentalphysik, Universitaet des Saarlandes, D-66041 Saarbruecken (Germany)
2. Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)
3. Los Alamos National Laboratory, Los Alamos, (New Mexico) 8754
4. Ames Laboratory and Iowa State University, Ames, Iowa 50011 (United States)
5. Department of Applied Physics, Stanford University, Stanford, California 94305 (United States)
6. Max-Planck-Institut fuer Festkoerperforschung, D-70569 Stuttgart (Germany)
7. Institut fuer Experimentalphysik, Universitaet Kiel, D-24118 Kiel (Germany)
8. Fakultat fuer Physik, Universitaet Konstanz, D-78434 Konstanz (Germany)

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.}

• DOE Contract Number: FG02-90ER45416
• OSTI ID: 288752
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 4 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANGULAR RESOLUTION
DENSITY FUNCTIONAL METHOD
ELECTRONIC STRUCTURE
FERMI LEVEL
LAYERED MATERIALS
ONE-DIMENSIONAL CALCULATIONS
PHOTOELECTRON SPECTROSCOPY
QUASI PARTICLES
SEMIMETALS
TITANIUM TELLURIDES