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Molecular nanomagnets, besides promising to open new frontiers in technology,have attracted huge interest in the scientific community because they canexhibit the phenomenon known as quantum tunnelling of the magnetization, i.e.coherent fluctuations of the direction of the total spin vector. In this paperwe study a different quantum phenomenon involving fluctuations of the magnitudeof the total spin vector. These fluctuations are related to the mixing betweenstates with different spin quantum number, and imply new macroscopic effects,which we theoretically investigated in the Mn-[3x3] grid.Comment: 10 pages latex, 6 figure

Macroscopic evidence of quantum coherent oscillations of the total spin in the Mn-[ $\mathsf{3\times3}$ ] molecular nanomagnet