Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Electronic Structure of Surfaces II
O 58.9: Vortrag
Mittwoch, 18. März 2015, 17:00–17:15, MA 041
Fermi surface tomography of the ferromagnetic transition metals Co and Ni by momentum microscopy — •Martin Ellguth1, Christian Tusche1, Alexander Krasyuk1, Vitaliy Feyer2, Carsten Wiemann2, Claus Michael Schneider2, and Jürgen Kirschner1,3 — 1Max-Planck-Institut für Mikrostrukturphysik, Halle — 2Peter-Grünberg-Institut, Forschungszentrum Jülich — 3Institut für Physik, Martin-Luther-Universität, Halle
The Fermi surface of a metal represents its electronic structure at one particular energy: the one which separates occupied from unoccupied electronic states. These states are responsible for the electric conductivity and related properties such as the thermoelectric behaviour. As such it is both interesting from a fundamental physics viewpoint as well as for applications. In this study, we have used momentum microscopy as a highly efficient photoemission experiment to probe the Fermi surface of the elemental ferromagnets Co and Ni. The combination of this setup with synchrotron radiation in the energy range from 30 eV to 200 eV allows for scanning the two-dimensional manifold through the perpendicular axis and thus acquire for the first time a volumetric dataset showing the Fermi surface for Co and Ni as photoemission resonances. The majority-spin surface and one of the minority surface sheets of Co are most clearly observed. Our data provides a sensitive test to the energetic position of electronic bands crossing the Fermi level, and therefore to a possible renormalization induced by many-body interactions.
M.E. acknowledges support from the BMBF (05K12EF1).