Field-tuned quantum tunneling in a supramolecule dimer $[Mn_4]_2$

TL;DR

This paper investigates quantum tunneling in a supramolecular dimer of single-molecule magnets, revealing step-like magnetization behavior and quantum resonant tunneling through numerical solutions aligned with experimental results.

Contribution

It provides a detailed quantum dynamical analysis of field-tuned tunneling in a coupled molecular magnet system, demonstrating agreement with experimental observations.

Findings

Observation of step-like magnetization curves

Quantitative evidence of quantum resonant tunneling

Effects of field sweeping rate on tunneling phenomena

Abstract

Field-tuned quantum tunneling in two single-molecule magnets coupled antiferromagnetically and formed a supramolecule dimer is studied. We obtain step-like magnetization curves by means of the numerically exact solution of the time-dependent Schr\H{o}dinger equation. The steps in magnetization curves show the phenomenon of quantum resonant tunneling quantitatively. The effects of the sweeping rate of applied field is discussed. These results obtained from quantum dynamical evolution well agree with the recent experiment[W.Wernsdorfer et al. Nature 416(2002)406].