Quantum Coherence between High Spin Superposition States of Single Molecule Magnet Ni4
E. del Barco, A. D. Kent, E. C. Yang, D. N. Hendrickson
Abstract
Magnetic quantum tunneling in a single molecule magnet (SMM) has been studied in experiments that combine microwave spectroscopy with high sensitivity magnetic measurements. By monitoring spin-state populations in the presence of microwave magnetic fields, the energy splittings between low lying high spin superposition states of SMM Ni4 (S = 4) have been measured. Absorption linewidths give an upper bound on the rate of decoherence. Pulsed microwave experiments provide a direct measure of the spin-lattice relaxation time, which is found to be remarkably long () and to increase with the energy splitting.
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