Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.70: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Coordination-driven magnetic-to-nonmagnetic transition in manganese doped silicon clusters — •Linn Leppert¹, Vicente Zamudio-Bayer^2,3, Konstantin Hirsch^2,3, Andreas Langenberg^2,3, Jochen Rittmann^2,3, Martin Kossick^2,3, Robert Richter³, Akira Terasaki⁴, Thomas Möller³, Stephan Kümmel¹, Bernd von Issendorff⁵, and J. Tobias Lau² — ¹Theoretische Physik IV, Universität Bayreuth, 95440 Bayreuth, GER — ²Institut für Methoden und Instrumentierung der Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, GER — ³Institut für Optik und Atomare Physik, Technische Universität Berlin, 10623 Berlin, GER — ⁴Cluster Research Laboratory, Toyota Technological Institute, 717-86 Futamata, Ichikawa, Chiba 272-0001, JP — ⁵Fakultät für Physik, Universität Freiburg, 79104 Freiburg, GER

X-ray Magnetic Circular Dichroism (XMCD) spectroscopy allows to obtain fundamental insight into magnetic properties of free, size-selected clusters. We demonstrate using a combination of XMCD and non-empirical density functional theory that the magnetic moment of small Si clusters doped with a single Mn impurity is completely quenched as soon as a cluster size of 10 Si atoms is exceeded. This is a result of an abrupt increase of the impurity coordination from 10 to 11 Si atoms. Since the impurity coordination in small exohedrally doped Si clusters is close to that observed in bulk Si, smaller clusters are, contrary to intuition, far better suited for prediciting the magnetic properties of the bulk system than larger endohedrally doped clusters.