Josephson Effect through an isotropic magnetic molecule

Abstract

We investigate the Josephson effect through a molecular quantum dot magnet connected to superconducting leads. The molecule contains a magnetic atom, whose spin is assumed to be isotropic. It is coupled to the electron spin on the dot via exchange coupling. Using the numerical renormalization 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 the modulus of exchange coupling increases. 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 antiferromagnetic exchange coupling. We suggest that the asymmetric dependence of supercurrent on the exchange coupling could be used as to detect its sign in experiments.

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Cited by in corpus (13)

• Self-consistent description of Andreev bound states in Josephson quantum dot devices
• Superconductivity in a single C60 transistor
• Magnetic anisotropy effects on quantum impurities in superconducting host
• Interaction of a Nanomagnet with a Weak Superconducting Link
• Josephson effect through a multilevel dot near a singlet-triplet transition
• Josephson-current induced conformational switching of a molecular quantum dot
• Single magnetic molecule between conducting leads: Effect of mechanical rotations
• Josephson effect through an anisotropic magnetic molecule
• Josephson current through a quantum dot coupled to a molecular magnet
• Superconducting molybdenum-rhenium electrodes for single-molecule transport studies
• Andreev spin-noise detector
• Critical Josephson current through a bistable single-molecule junction
• Spin nutation effects in molecular nanomagnet$-$superconductor tunnel junctions