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Effect of Magnetic Soft Mode on 87Rb Nuclear Spin-Lattice Relaxation in Singlet-Ground-State System RbFeCl3

The nuclear spin-lattice relaxation time T 1 of 87 Rb in the singlet-ground-state easy-plane antiferromagnet RbFeCl 3 has been measured at the temperatures above and below T N ≈2.5 K with the external field applied both along and perpendicularly to the hard c -axis. From the analysis based on the dynamical correlated-effective-field approximation, it is found that the trend of the divergence of T 1 -1 in the paramagnetic phase around T N is closely related to the remarkable softening of the magnetic excitation for the K-point mode (\(\bm{q}=\bm{q}_{0}\)) via the in-plane component of the static susceptibility χ (\(\bm{q}_{0}\)).