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O: Fachverband Oberflächenphysik

O 98: Electronic structure: Surface magnetism and spin phenomena I

O 98.5: Talk

Thursday, March 15, 2018, 16:00–16:15, MA 042

Controled spin switch in a nickelocene molecular junction — •Benjamin Verlhac¹, Maider Ormaza¹, Nicolas Bachellier¹, Paula Abufager², Marie-Laure Bocquet³, Nicolás Lorente⁴, and Laurent Limot¹ — ¹Université de Strasbourg, CNRS, IPCMS, Strasbourg, France — ²Instituto de Física de Rosario-CONICET-Universidad Nacional de Rosario,Rosario, Argentina — ³ENS-CNRS-UPMC, Paris, France — ⁴Donostia International Physics Center (DIPC), San Sebastián, Spain

One of the main challenges in molecular spintronics is to achieve an active control of a molecular spin. This is possible through the modification of the molecular structure either by chemical doping or by external stimuli. Here we investigate the effect of varying the electrode-electrode distance in a controled way in a single nickelocene molecular junction using a low-temperature scanning tunneling microscope. The molecule, when attached to the metallic tip of the microscope, exhibits spin excitations in the tunneling regime, while a Kondo ground state emerges upon contact with a Cu(100) surface, causing then an order of magnitude change in the zero-bias conductance. First principle calculations show that nickelocene reversibly switches from a spin 1 to 1/2 between the two transport regimes.