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Medientyp:
E-Artikel
Titel:
Observation of the underscreened Kondo effect in a molecular transistor
Beteiligte:
Roch, N.
[Verfasser:in];
Florens, S.
[Verfasser:in];
Costi, T. A.
[Verfasser:in];
Wernsdorfer, W.
[Verfasser:in];
Balestro, F.
[Verfasser:in]
Anmerkungen:
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Beschreibung:
We present the first quantitative experimental evidence for the underscreened Kondo effect, an incomplete compensation of a quantized magnetic moment by conduction electrons, as originally proposed by Noziegraveres and Blandin. The device consists of an even charge spin S=1 molecular quantum dot, obtained by electromigration of C-60 molecules into gold nanogaps and operated in a dilution fridge. The persistence of logarithmic singularities in the low temperature conductance is demonstrated by a comparison to the fully screened configuration obtained in odd charge spin S=1/2 Coulomb diamonds. We also discover an extreme sensitivity of the underscreened Kondo resonance to the magnetic field that we confirm on the basis of numerical renormalization group calculations.