HAL : hal-00276921, version 1

arXiv : 0805.0301

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v1 (02-05-2008)

v2 (07-07-2008)

v3 (27-08-2008)

Josephson Effect through a Magnetic Metallofullerene Molecule

Minchul Lee 1, Thibaut Jonckheere 1, Thierry Martin 1

(02/05/2008)

We investigate the Josephson effect through a molecular quantum dot magnet connected to superconducting leads. The molecule depicts a metallofullerene where the spin of the magnetic atom inside the carbon shell is assumed to be isotropic. It is coupled to the electron spin on the dot via exchange coupling. Using the numerical normalization group method we calculate the Andreev levels and the supercurrent and examine intertwined effect of the exchange coupling, Kondo correlation, and superconductivity on the current. Exchange coupling typically suppresses the Kondo correlation so that the system undergoes a phase transition from 0 to $\pi$ state as |J| increases, where J is the exchange coupling constant. Antiferromagnetic coupling is found to drive exotic transitions: the reentrance to the Pi state for a small superconducting gap and the restoration of 0 state for large J. We suggest that the asymmetric dependence of supercurrent on J could be used as to detect the sign of J in experiments.

1 :	Centre de Physique Théorique (CPT)
	CNRS : FR2291 – Université de Provence - Aix-Marseille I – Université de la Méditerranée - Aix-Marseille II – Université Sud Toulon Var

Domaine

:

Physique/Matière Condensée/Systèmes mésoscopiques et effet Hall quantique

Mots Clés : molecular electronics – spintronics – quantum dots – Kondo effect – numerical renormalization group – metallofullerene – Josephson effect

hal-00276921, version 1

http://hal.archives-ouvertes.fr/hal-00276921

oai:hal.archives-ouvertes.fr:hal-00276921

Contributeur : Thierry Martin <>

Soumis le : Vendredi 2 Mai 2008, 18:13:00

Dernière modification le : Vendredi 2 Mai 2008, 21:43:13