Low-energy spin excitations inMn3×3molecular nanomagnets

摘要: NMR and $\ensuremath{\mu}\mathrm{SR}$ relaxation measurements in the ${\mathrm{Mn}}_{9}{({\mathrm{C}}_{19}{\mathrm{H}}_{15}{\mathrm{N}}_{9}{\mathrm{O}}_{2})}_{6}{({\mathrm{ClO}}_{4})}_{6}.18{\mathrm{H}}_{2}\mathrm{O}({\mathrm{Mn}}_{3\ifmmode\times\else\texttimes\fi{}3})$ molecular grid are presented. The temperature dependence of rates can be conveniently described by a single correlation time for spin fluctuations at temperatures order exchange coupling among ${\mathrm{Mn}}^{2+}$ ions. inverse is observed to reach MHz range low its justified on basis theoretical model where electron driven spin-phonon coupling. Finally, it pointed out that magnetic field rate allows one derive Zeeman splitting low-energy levels.