Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 5: Electron Theory of Magnetism
MA 5.6: Vortrag
Montag, 23. März 2009, 12:15–12:30, HSZ 103
Lifshitz transitions in FePt due to a canted magnetic field — •Hongbin Zhang and Manuel Richter — IFW Dresden, Helmholtzstraße 20, 01069 Dresden
By density functional calculations, we show that in L10 FePt, a canted magnetic field can induce changes of the topology of the Fermi surfaces. This is a new driving force for such electronic topological transitions (also called Lifshitz transition) besides pressure, doping, and magnetic field of arbitrary direction. To elucidate its effects, we estimate the variation of thermopower using a simple two-band model. It is shown explicitly, that due to interband scattering, thermopower would have singular behavior at such transitions. However, strong smearing by chemical disorder will make it hard to observe such anomalies experimentally.