Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 5: Nanostructures at surfaces: Wires, tubes
O 5.4: Vortrag
Montag, 23. März 2009, 12:00–12:15, SCH A215
Magnetism versus formation of transition-metal chains in break junctions — •Alexander Thiess1,2, Yuriy Mokrousov1,2, Stefan Heinze2, and Stefan Blügel1 — 1Institut für Festkörperfor-schung and Institute for Advanced Simulation, Forschungszentrum Jülich, 52545 Jülich, Germany — 2Institute of Applied Physics, University of Hamburg, 20355 Hamburg, Germany
One of the pressing issues in break junction (BJ) experiments is the experimental search for evidence of magnetism in suspended monoatomic transition-metal (TM) chains [1]. Our strategy to tackle this question is a theoretical analysis of the most fundamental and transparent quantity of these systems: the probability for successful chain creation itself. On the basis of ab initio calculations both including and excluding spin-polarization of 3d, 4d and 5d TM chains we developed a model describing chain formation in BJs [2]. Contrasting the different probabilities of forming non-magnetic or magnetic chains, we find that emerging magnetism suppresses the tendency to chain formation. Comparing our results to
existing experiments may serve as a proof that even 5d chains
in BJs are magnetic.
[1] C. Untiedt, D.M.T Dekker, D. Djukic, J.M. van Ruitenbeek, Phys. Rev. B 69, 081401 (2004)
[2] A. Thiess, Y. Mokrousov, S. Blügel, S. Heinze, Nano Letters 8, 2144 (2008)