Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 49: Electronic structure IV
O 49.7: Vortrag
Freitag, 31. März 2006, 12:45–13:00, WIL B321
Electronic bandstructure of the NiMnSb(001) surface below and above the Fermi energy — •Christian Eibl, Juliet Slayton Correa, Georgi Rangelov, Jürgen Braun, and Markus Donath — Physikalisches Institut, Westfälische Wilhelms-Universität Münster, 48149 Münster
For more than 20 years the Half-Heusler alloy NiMnSb has been investigated because of its predicted 100% spin polarization at the Fermi energy EF [1]. Together with its high Curie temperature (750 K), this material is interesting for many technological applications.
We report on surface bandstructure measurements for the (001) surface of single crystal NiMnSb. The experimental techniques used are angle resolved ultraviolet photoemission spectroscopy (ARUPS) und inverse Photoemission spectroscopy (ARIPES) to probe the bandstructure both below and above EF. ARUPS and ARIPES are used quasi-simultaneously in a multi-chamber UHV-system to ensure well defined and equal sample preparation conditions.
We see both non-dispersive (ARIPES) and dispersive (ARUPS) structures in the spectra, which stem from d-like bulk states. Furthermore, by comparison with theoretical calculations, we have found a surface state candidate.
[1] R.A. deGroot et al., Phys. Rev. Lett. 50, 2024 (1983)