Large Magnetoresistance in Single-Radical Molecular Junctions

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HAYAKAWA, Ryoma, Mohammad Amin KARIMI, Jannic WOLF, Thomas HUHN, Martin Sebastian ZÖLLNER, Carmen HERRMANN, Elke SCHEER, 2016. Large Magnetoresistance in Single-Radical Molecular Junctions. In: Nano Letters. 16(8), pp. 4960-4967. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.6b01595

@article{Hayakawa2016-08-10Large-35186, title={Large Magnetoresistance in Single-Radical Molecular Junctions}, year={2016}, doi={10.1021/acs.nanolett.6b01595}, number={8}, volume={16}, issn={1530-6984}, journal={Nano Letters}, pages={4960--4967}, author={Hayakawa, Ryoma and Karimi, Mohammad Amin and Wolf, Jannic and Huhn, Thomas and Zöllner, Martin Sebastian and Herrmann, Carmen and Scheer, Elke} }

<rdf:RDF xmlns:dcterms="" xmlns:dc="" xmlns:rdf="" xmlns:bibo="" xmlns:dspace="" xmlns:foaf="" xmlns:void="" xmlns:xsd="" > <rdf:Description rdf:about=""> <dc:contributor>Herrmann, Carmen</dc:contributor> <dcterms:hasPart rdf:resource=""/> <dc:creator>Huhn, Thomas</dc:creator> <dcterms:abstract xml:lang="eng">Organic radicals are promising building blocks for molecular spintronics. Little is known about the role of unpaired electrons for electron transport at the single-molecule level. Here, we examine the impact of magnetic fields on electron transport in single oligo(p-phenyleneethynylene) (OPE)-based radical molecular junctions, which are formed with a mechanically controllable break-junction technique at a low temperature of 4.2 K. Surprisingly huge positive magnetoresistances (MRs) of 16 to 287% are visible for a magnetic field of 4 T, and the values are at least 1 order of magnitude larger than those of the analogous pristine OPE (2-4%). Rigorous analysis of the MR and of current-voltage and inelastic electron-tunneling spectroscopy measurements reveal an effective reduction of the electronic coupling between the current-carrying molecular orbital and the electrodes with increasing magnetic field. We suggest that the large MR for the single-radical molecular junctions might be ascribed to a loss of phase coherence of the charge carriers induced by the magnetic field. Although further investigations are required to reveal the mechanism underlying the strong MR, our findings provide a potential approach for tuning charge transport in metal-molecule junctions with organic radicals.</dcterms:abstract> <dc:contributor>Scheer, Elke</dc:contributor> <dc:contributor>Huhn, Thomas</dc:contributor> <dspace:isPartOfCollection rdf:resource=""/> <dcterms:issued>2016-08-10</dcterms:issued> <dspace:isPartOfCollection rdf:resource=""/> <dc:creator>Scheer, Elke</dc:creator> <dspace:hasBitstream rdf:resource=""/> <dc:rights>terms-of-use</dc:rights> <dc:contributor>Karimi, Mohammad Amin</dc:contributor> <dc:creator>Hayakawa, Ryoma</dc:creator> <dc:creator>Karimi, Mohammad Amin</dc:creator> <dcterms:isPartOf rdf:resource=""/> <dc:language>eng</dc:language> <dc:creator>Wolf, Jannic</dc:creator> <foaf:homepage rdf:resource="http://localhost:8080/jspui"/> <dc:creator>Herrmann, Carmen</dc:creator> <bibo:uri rdf:resource=""/> <dc:creator>Zöllner, Martin Sebastian</dc:creator> <dc:date rdf:datatype="">2016-09-09T08:10:28Z</dc:date> <dcterms:rights rdf:resource=""/> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dc:contributor>Hayakawa, Ryoma</dc:contributor> <dcterms:available rdf:datatype="">2016-09-09T08:10:28Z</dcterms:available> <dc:contributor>Wolf, Jannic</dc:contributor> <dcterms:isPartOf rdf:resource=""/> <dc:contributor>Zöllner, Martin Sebastian</dc:contributor> <dcterms:title>Large Magnetoresistance in Single-Radical Molecular Junctions</dcterms:title> </rdf:Description> </rdf:RDF>

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