Large Magnetoresistance in Single-Radical Molecular Junctions

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Nano Letters. 2016, 16(8), pp. 4960-4967. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.6b01595
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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.

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530 Physik
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Single organic radicals, large magnetoresistance, charge transport, mechanically controllable break junction
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ISO 690HAYAKAWA, 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. 2016, 16(8), pp. 4960-4967. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.6b01595
BibTex
@article{Hayakawa2016-08-10Large-35186,
  year={2016},
  doi={10.1021/acs.nanolett.6b01595},
  title={Large Magnetoresistance in Single-Radical Molecular Junctions},
  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}
}
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