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In response to recent nuclear-magnetic-resonance (NMR) measurements on themolecular cluster Mn_{12}O_{12} acetate, we study the nuclear spin-latticerelaxation rate 1/T_1 developing a modified spin-wave theory. Our microscopicnew approach, which is distinct from previous macroscopic treatments of thecluster as a rigid spin of S=10, not only excellently interprets the observedtemperature and applied-field dependences of 1/T_1 for ^{55}Mn nuclei but alsostrongly supports the ^{13}C NMR evidence for spin delocalization over theentire molecule.Comment: to be published in Phys. Rev. Lett., 4 pages, 4 figures embedde

physical review letters

Spin-Wave Description of Nuclear Spin-Lattice Relaxation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">M</mml:mi><mml:msub><mml:mi mathvariant="normal">n</mml:mi><mml:mn mathvariant="normal">12</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn mathvariant="normal">12</mml:mn></mml:msub></mml:math>Acetate

Spin-Wave Description of Nuclear Spin-Lattice Relaxation inMn12O12Acetate