Berlin 2005 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MA: Magnetismus

MA 12: Elektronentheorie

MA 12.2: Vortrag

Samstag, 5. März 2005, 09:15–09:30, TU EMH225

Magnetism in gold nanostructures — •Ingo Opahle, Arti Kashyap, Mahdi Sargolzaei, Klaus Koepernik, Ulrike Nitzsche, Manuel Richter, and Helmut Eschrig — IFW Dresden, P.O.B. 270016, D-01171 Dresden, Germany

As a bulk material, gold does not show any sign of ordered magnetism. Nanostructured materials, on the other hand, have been shown in recent years to have surprising features, sometimes completely different from the bulk phase. In a recent experiment [1] evidence for magnetism in small gold clusters was provided.

In this work, the electronic structure of gold nanostructures (monoatomic gold chain, small clusters) is investigated by means of relativistic density functional theory calculations, with a particular focus on tendencies towards magnetic instabilities. A monoatomic gold chain, for example, becomes magnetic at Au-Au nearest neighbour distances close to those of bulk gold. The calculated magnetic moment reaches up to 0.2 µ_B with a dominating contribution of the orbital moment of 0.12 µ_B.

[1] Y. Yamamoto et al., Phys. Rev. Lett. 93, 116801 (2004).