Kondo Effect in a Neutral and Stable All Organic Radical Single Molecule Break Junction

Organic radicals are neutral, purely organic molecules exhibiting an intrinsic magnetic moment due to the presence of an unpaired electron in the molecule in its ground state. This property, added to the low spin–orbit coupling and weak hyperfine interactions, make neutral organic radicals good cand...

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Bibliographic Details
Published in:Nano letters Vol. 15; no. 5; pp. 3109 - 3114
Main Authors: Frisenda, Riccardo, Gaudenzi, Rocco, Franco, Carlos, Mas-Torrent, Marta, Rovira, Concepció, Veciana, Jaume, Alcon, Isaac, Bromley, Stefan T, Burzurí, Enrique, van der Zant, Herre S. J
Format: Journal Article
Language:English
Published: United States American Chemical Society 13.05.2015
Subjects:
Anomalies
Breaking
Density
Electron transport
Electrostatics
Electrònica de l'estat sòlid
Espintrònica
Kondo effect
Magnetism
Magnetisme
Radicals
Solid state electronics
Spintronics
Transport d'electrons
organic radical
magnetism
Kondo effect
electrical transport
break junction
Single molecule
ISSN:1530-6984, 1530-6992
Online Access:Get full text
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Summary:Organic radicals are neutral, purely organic molecules exhibiting an intrinsic magnetic moment due to the presence of an unpaired electron in the molecule in its ground state. This property, added to the low spin–orbit coupling and weak hyperfine interactions, make neutral organic radicals good candidates for molecular spintronics insofar as the radical character is stable in solid state electronic devices. Here we show that the paramagnetism of the polychlorotriphenylmethyl radical molecule in the form of a Kondo anomaly is preserved in two- and three-terminal solid-state devices, regardless of mechanical and electrostatic changes. Indeed, our results demonstrate that the Kondo anomaly is robust under electrodes displacement and changes of the electrostatic environment, pointing to a localized orbital in the radical as the source of magnetism. Strong support to this picture is provided by density functional calculations and measurements of the corresponding nonradical species. These results pave the way toward the use of all-organic neutral radical molecules in spintronics devices and open the door to further investigations into Kondo physics.
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ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.5b00155