Kondo-transport spectroscopy of single molecule magnets

TL;DR

This paper explores how the Kondo effect in single molecule magnets involves all magnetic excitations and can be modulated by magnetic anisotropy and fields, enabling detailed transport spectroscopy of magnetic states.

Contribution

It reveals that the Kondo effect in SMMs involves all magnetic excitations and can be used for precise spectroscopy of magnetic states, with a relationship established between different spin states.

Findings

Kondo temperature can exceed magnetic splittings.

Kondo effect modulated by transverse anisotropy and magnetic field.

Transport spectroscopy of magnetic states achieved at low fields.

Abstract

We demonstrate that in a single molecule magnet (SMM) strongly coupled to electrodes the Kondo effect involves all magnetic excitations. This Kondo effect is induced by the quantum tunneling of the magnetic moment (QTM). Importantly, the Kondo temperature $T_K$ can be much larger than the magnetic splittings. We find a strong modulation of the Kondo effect as function of the transverse anisotropy parameter or a longitudinal magnetic field. For both integer and half-integer spin this can be used for an accurate transport spectroscopy of the magnetic states in low magnetic fields on the order of the easy-axis anisotropy parameter. We set up a relationship between the Kondo effects for successive integer and half-integer spins.