Spin Dynamics in Molecular Antiferromagnetic Ring Fe10 (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

概要

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Spin dynamics in the antiferromagnetic ring Fe10 has been studied by means of magnetic susceptibility and ^1H-NMR experiments. The spin-lattice relaxation rate 1/T_1 above 40K reflects the spin fluctuations in the continuous energy levels of the spin states, while the rate below 40K indicates the development of antiferromagnetic correlations and discrete energy levels. Especially the experimental rates below 4K can be expressed by an exponential function of the temperature with an energy gap between the singlet ground state and the triplet excited state. The field dependence of the low-lying energy levels was clearly revealed by the 1/T_1 measurements. On the other hand, the spin-spin relaxation rate 1/T_2 is dominated by the temperature-independent fluctuations of the nuclear dipolar fields and a small contribution proportional to 1/T_1, and is consistent with the spectral widths.
社団法人日本物理学会の論文
2006-03-15