Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.197202
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Funding
- ANR-PNANO Projects MolSpintronics [ANR-06-NANO-27]
- MolNanoSpin [ANR-08-NANO-002]
- ERC Advanced [226558]
- STEP MolSpinQIP
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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.
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