Interplay between Magnetoresistance and Kondo Resonance in Radical Single-Molecule Junctions

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2022
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Low, Jonathan Z.
Wei, Sujun
Francisco, Karol R.
Deffner, Michael
Herrmann, Carmen
Campos, Luis M.
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We report transport measurements on tunable single-molecule junctions of the organic perchlorotrityl radical molecule, contacted with gold electrodes at low temperature. The current–voltage characteristics of a subset of junctions shows zero-bias anomalies due to the Kondo effect and in addition elevated magnetoresistance (MR). Junctions without Kondo resonance reveal a much stronger MR. Furthermore, we show that the amplitude of the MR can be tuned by mechanically stretching the junction. On the basis of these findings, we attribute the high MR to an interference effect involving spin-dependent scattering at the metal–molecule interface and assign the Kondo effect to the unpaired spin located in the center of the molecule in asymmetric junctions.

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530 Physik
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Tunable single-molecule junctions, prganic perchlorotrityl radical molecule, gold electrodes, low temperature, Kondo effect
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ISO 690MITRA, Gautam, Jonathan Z. LOW, Sujun WEI, Karol R. FRANCISCO, Michael DEFFNER, Carmen HERRMANN, Luis M. CAMPOS, Elke SCHEER, 2022. Interplay between Magnetoresistance and Kondo Resonance in Radical Single-Molecule Junctions. In: Nano Letters. American Chemical Society (ACS). 2022, 22(14), pp. 5773-5779. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.2c01199
BibTex
@article{Mitra2022-07-27Inter-58078,
  year={2022},
  doi={10.1021/acs.nanolett.2c01199},
  title={Interplay between Magnetoresistance and Kondo Resonance in Radical Single-Molecule Junctions},
  number={14},
  volume={22},
  issn={1530-6984},
  journal={Nano Letters},
  pages={5773--5779},
  author={Mitra, Gautam and Low, Jonathan Z. and Wei, Sujun and Francisco, Karol R. and Deffner, Michael and Herrmann, Carmen and Campos, Luis M. and Scheer, Elke}
}
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