Kondo effects in a C60 single-molecule transistor

Nicolas Roch (1) , Clemens Winkelmann (2) , Serge Florens (3) , Vincent Bouchiat (4) , Wolfgang Wernsdorfer (1) , Franck Balestro (1)

1 NEEL - QuantECA - Circuits électroniques quantiques Alpes
2 NEEL - QuNES - Nano-Electronique Quantique et Spectroscopie
3 NEEL - ThQC - Théorie Quantique des Circuits
4 NEEL - Quan2m - Interactions modulables dans des états quantiques 2D

We have used the electromigration technique to fabricate a $\rm{C_{{60}}}$ single-molecule transistor (SMT). We present a full experimental study as a function of temperature, down to 35 mK, and as a function of magnetic field up to 8 T in a SMT with odd number of electrons, where the usual spin-1/2 Kondo effect occurs, with good agreement with theory. In the case of even number of electrons, a low temperature magneto-transport study is provided, which demonstrates a Zeeman splitting of the zero-bias anomaly at energies well below the Kondo scale.

Domaines: Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Nicolas Roch, Clemens Winkelmann, Serge Florens, Vincent Bouchiat, Wolfgang Wernsdorfer, et al.. Kondo effects in a C60 single-molecule transistor. physica status solidi (b), 2008, 245 (10), pp.1994-1997. ⟨10.1002/PSSB.200879621⟩. ⟨hal-00700047⟩