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Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 1: Cluster

MO 1.5: Talk

Monday, March 18, 2013, 12:00–12:15, F 102

Coordination-driven magnetic-to-nonmagnetic transition in manganese doped silicon clustersVicente Zamudio-Bayer1,2, Linn Leppert3, Konstantin Hirsch1,2, Andreas Langenberg1,2, Jochen Rittmann1,2, Martin Kossick1,2, Robert Richter2, Akira Terasaki4,5, Thomas Möller2, Bernd von Issendorff6, Stefan Kümmel3, and •Tobias Lau11Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin — 2Institut für Optik und Atomare Physik, Technische Universität Berlin, 10623 Berlin — 3Theoretische Physik IV, Universität Bayreuth, 95440 Bayreuth — 4Cluster Research Laboratory, Toyota Technological Institute, Chiba, Japan — 5Department of Chemistry, Kyushu University, Fukuoka, Japan — 6Fakultät für Physik, Universität Freiburg, 79104 Freiburg

X-ray Magnetic Circular Dichroism (XMCD) spectroscopy allows to obtain fundamental insight into magnetic properties of free, size-selected clusters. Using a combination of XMCD and non-empirical density functional theory, we demonstrate that the magnetic moment of MnSin+ is completely quenched as soon as a cluster size of n = 10 is exceeded. This is the result of a structural transition with an abrupt increase of the impurity coordination, which takes place between MnSi10+ and MnSi11+ and is accompanied by marked changes in the local electronic structure of the manganese impurity.

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