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Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 6: Quantum Magnets and Molecular Magnets (joint session TT/MA)

TT 6.13: Talk

Monday, March 12, 2018, 12:45–13:00, H 3010

Formation of Local Magnetic Order in Atomic-Scale Ir Junctions — •Markus Ritter, Martin Keller, Torsten Pietsch, and Elke Scheer — Department of Physics, University of Konstanz, D-78467 Konstanz, Germany

The transition metals Pt, Pd, and Ir are paramagnets close to the Stoner transition of ferromagnetism. However, in reduced dimensions, such as small clusters and atomic contacts, a magnetically ordered state has been predicted [1]. In atomic contacts of the elements Pt and Pd, the emergence of local magnetic order has been experimentally confirmed recently [2, 3]. Currently there is no demonstration of such phenomena in Ir. Therefore, we investigate the magnetic properties of atomic Ir contacts and monoatomic chains [4]. The occurrence of local magnetic order is deduced from magnetoconductance (MC) and anisotropic magnetoconductance (AMC) measurements. The rich MC behavior is interpreted in the framework of a microscopic model of the local magnetic configuration and is compared to earlier findings in Pt and Pd contacts. Furthermore, in many contacts electronic transport (d I /d V ) spectroscopy shows a pronounced zero-bias anomaly (ZBA) and further features, which are currently not fully understood. The ZBA is analyzed in the context of Kondo screening of the local magnetic moment in the junction.
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