Abstract
The crystals of a Mn 12 cluster, [Mn 12O 12(O 2CC 6H 5) 16(H 2O) 4]·2C 6H 5CO 2H, are mosaic involving two kinds of molecules with different relaxation rates. The ratios of the two components in the crystals are strongly batch-dependent. We prepared a batch of crystals in which mainly contained the fast relaxation (FR) species and studied the muon spin relaxation (μSR) measurements in the range 0.3–80 K at zero-field (ZF). As the temperature was lowered, the decay of the muon asymmetry showed systematic temperature dependence: the dynamic and the static behavior of the internal-field appear alternately. This is probably due to the magnetization blocking of the FR molecule.
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