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American Physical Society, Physical Review Letters, 5(111), 2013

DOI: 10.1103/physrevlett.111.057201

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Quantum Interference Oscillations of the Superparamagnetic Blocking in anFe8Molecular Nanomagnet

Journal article published in 2013 by E. Burzurí ORCID, F. Luis, O. Montero, B. Barbara, R. Ballou, S. Maegawa
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We show that the dynamic magnetic susceptibility and the superparamagnetic blocking temperature of an Fe8 single molecule magnet oscillate as a function of the magnetic field Hx applied along its hard magnetic axis. These oscillations are associated with quantum interferences, tuned by Hx, between different spin tunneling paths linking two excited magnetic states. The oscillation period is determined by the quantum mixing between the ground S=10 and excited multiplets. These experiments enable us to quantify such mixing. We find that the weight of excited multiplets in the magnetic ground state of Fe8 amounts to approximately 11.6%. ; Comment: Accepted in Phys. Rev. Lett