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We show that the dynamic magnetic susceptibility and the superparamagneticblocking temperature of an Fe8 single molecule magnet oscillate as a functionof the magnetic field Hx applied along its hard magnetic axis. Theseoscillations are associated with quantum interferences, tuned by Hx, betweendifferent spin tunneling paths linking two excited magnetic states. Theoscillation period is determined by the quantum mixing between the ground S=10and excited multiplets. These experiments enable us to quantify such mixing. Wefind that the weight of excited multiplets in the magnetic ground state of Fe8amounts to approximately 11.6%.

Quantum interference oscillations of the superparamagnetic blocking in an Fe8 molecular nanomagnet