Experimental evidence of the dependence of spin tunnelling on the concentration of dislocations in Mn12 crystals

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We present experimental results on resonant spin tunnelling in a single crystal of Mn₁₂-2Cl benzoate with different concentration of dislocations. The time evolution of the magnetisation follows the stretched exponential over a few time decades. The values of parameters of stretched exponential deduced from experiment have been used to determine the concentration of dislocations before and after the cooling-annealing process, using the algorithm recently suggested by Garanin and Chudnovsky.