Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 21: Elektronische Struktur II

O 21.1: Vortrag

Samstag, 5. März 2005, 10:45–11:00, TU EB107

Contribution of electron-magnon scattering to the lifetimes of lanthanide-metal surface states studied by scanning tunneling spectroscopy — •Daniel Wegner, Andreas Bauer, and Günter Kaindl — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin-Dahlem

While electron dynamics at surfaces of noble metals is well understood by now, we still have a rather poor knowledge of electron dynamics at transition-metal surfaces, in particular for magnetic systems where electron-magnon scattering has to be taken into account. A better understanding would be of particular importance for spin electronics.

We have systematically studied lifetime broadening of exchange-split (0001)-surface states for all trivalent lanthanide metals by low-temperature scanning tunneling spectroscopy (STS) at 10 K. Since those states are highly spin-polarized, they allow for a separate analysis of majority (spin-up) and minority (spin-down) states. The results give evidence for strong electron-magnon scattering of the minority states, while for the majority states, electron-electron and electron-phonon scattering seem to be dominant.