Josephson Effect through an Isotropic Magnetic Molecule
Minchul Lee, Thibaut Jonckheere, Thierry Martin
DOI 10.1103/PhysRevLett.101.146804 · Physical Review Letters
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Abstract
We study the Josephson effect through a quantum dot magnet whose spin is isotropic and which is coupled to the dot electron spin via exchange coupling. We calculate the Andreev levels and the supercurrent and examine the intertwined effect of the exchange coupling, Kondo correlation, and superconductivity. The former suppresses Kondo correlations, which triggers phase transitions from the 0 to the π state, but strong antiferromagnetic coupling restores the 0 state. The asymmetric phase diagram in the exchange coupling suggests that the coupling sign could be determined in experiments.
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