Spin Quantum Tunneling in Single Molecular Magnets: Fingerprints in Transport Spectroscopy of Current and Noise

2006/05/01 by C. Romeike, M. Wegewijs, M. R. Wegewijs +2
Materials Science · #Magnetism in coordination complexes #Organic and Molecular Conductors Research #Lanthanide and Transition Metal Complexes

paper · doi:10.1103/physrevlett.96.196805

Abstract

We demonstrate that transport spectroscopy of single molecular magnets shows signatures of quantum tunneling at low temperatures. We find current and noise oscillations as a function of bias voltage due to a weak violation of spin-selection rules by quantum tunneling processes. The interplay with Boltzmann suppression factors leads to fake resonances with temperature-dependent position which do not correspond to any charge excitation energy. Furthermore, we find that quantum tunneling can completely suppress transport if the transverse anisotropy has a high symmetry.

Related

• Manifestation of Spin Selection Rules on the Quantum Tunneling of Magnetization in a Single Molecule Magnet
• A Microscopic and Spectroscopic View of Quantum Tunneling of Magnetization
• Interaction of spin and vibrations in transport through single-molecule magnets
• Quantum tunneling of magnetization in molecular spin
• Transverse magnetization and transient oscillations in the quantum tunneling of molecular magnets