Cotunneling through a magnetic single-molecule transistor based on N\atC60

TL;DR

This study investigates cotunneling effects in a magnetic single-molecule transistor based on N@C60, combining experimental measurements and theoretical analysis to reveal magnetic interactions and conductance behaviors.

Contribution

It provides the first combined experimental and theoretical analysis of cotunneling in N@C60-based transistors, highlighting magnetic signatures due to exchange interactions.

Findings

Observation of cotunneling effects in Coulomb blockade regime.

Evidence of antiferromagnetic exchange interaction between spins.

Agreement between experimental conductance data and theoretical models.

Abstract

We present an experimental and theoretical study of a magnetic single-molecule transistor based on N@C60 connected to gold electrodes. Particular attention is paid to the regime of intermediate molecule-lead coupling, where cotunneling effects manifest themselves in the Coulomb-blockade regime. The experimental results for the differential conductance as a function of bias, gate voltage, and external magnetic field are in agreement with our analysis of the tunneling rates and provide evidence of magnetic signatures in single-N@C60 devices arising from an antiferromagnetic exchange interaction between the C60 spin and the nitrogen spin.