Have resonance experiments seen macroscopic quantum coherence in magnetic particles?
Recent magnetic resonance experiments on ferritin and nanofabricated magnetic dots of Fe(CO)5 have been interpreted in the framework of macroscopic quantum coherence (MQC). The power absorption in MQC is calculated and shown to be exceeded by a factor of 50 to 150 in the ferritin experiments. Alternative microscopic causes for the resonance are suggested. In the Fe(CO)5 experiments, MQC predicts no resonance at all at the ac fields involved, and the power absorbed is 1018 times larger than expected.
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