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By using the pulsed 55 Mn NMR in Mn 12 Ac, the avalanche effect for the magnetization recovery was observed in assembly of small pieces of single crystals between 0.1 and 1.6K in the field range from 0.7 to 1.5T. These results are consistent with the result of the previous Paulsen et al.'s measurement of hysteresis curve of the magnetization by SQUID.
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