Josephson effect through an anisotropic magnetic molecule

TL;DR

This paper investigates how anisotropic magnetic molecules influence the Josephson effect, revealing that exchange coupling and spin anisotropy can induce state transitions and affect the critical current, providing insights into molecular spin properties.

Contribution

The study demonstrates how spin anisotropy impacts the Josephson effect and introduces a method to probe molecular spin anisotropy via critical current measurements.

Findings

Exchange coupling can induce a transition from π to 0 state.

Critical current behavior reveals information about spin anisotropy.

Spin anisotropy affects the Josephson current in magnetic molecules.

Abstract

We study the Josephson effect through a magnetic molecule with anisotropic properties. Performing calculations in the tunneling regime, we show that the exchange coupling between the electron spin on the molecule and the molecular spin can trigger a transition from the $\pi$ state to the 0 state, and we study how the spin anisotropy affects this transition. We show that the behavior of the critical current as a function of an external magnetic field can give access to valuable information about the spin anisotropy of the molecule.