Quantum superposition of high spin states in the single molecule magnet Ni4.
Quantum tunneling of the magnetization in a single molecule magnet has been studied in experiments that combine microwave spectroscopy with high sensitivity magnetic measurements. By monitoring spin-state populations in the presence of microwave radiation, the energy splittings between low lying superpositions of high-spin states of single molecule magnet Ni4 (S=4) have been measured. Absorption linewidths give an upper bound on the rate of decoherence. Pulsed microwave experiments provide a measure of energy relaxation time, which is found to increase with frequency.
del Barco
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Department of Physics, New York University, 4 Washington Place, New York, New York 10003, USA.
Kent
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Yang
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Hendrickson
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