Regensburg 1998 – wissenschaftliches Programm

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O: Oberflächenphysik

O 34: Poster (II)

O 34.18: Poster

Donnerstag, 26. März 1998, 20:00–22:30, Bereich C

Valence band structure of α-MoTe₂ determined by ARPES in the CFS mode — •Th. B"oker, A. M"uller, J. Augustin, C. Ribbat, C. Janowitz, and R. Manzke — Institut f"ur Physik, Humboldt-Universit"at zu Berlin, Invalidenstraße 110, D-10115 Berlin

MoTe₂ belongs to the large family of layered transition metal dichalcogenides (LTMD) whose crystal structure results from the stacking of sheets of hexagonally packed atoms in the sequence Te-Mo-Te, Te-Mo-Te. The band-structure of α-MoTe₂ has been determined using angle-resolved photoelectron spectroscopy (ARPES) in the constant final state (CFS) mode. The angular and energy resolution is better than in previous measurements [1] and therefore a more detailed study of the complex valence band structure became possible. Additionally the occurence of a rather dispersionless peak like in other LMTD about 1eV below the VBM is observed which can not be explained within the one particle-band structure. A discussion of possible explanations about the origin of this state will be given in addition to reference [2].
This work has been suported by the BMBF under project number 05 622 KHA.

[1] I.T. McGovern, R.H. Williams, J. Phys. C 12, 2689 (1979)

[2] R. Coehoorn, C. Haas, Phys. Rev. B 35(12), 6195 (1987)