Transferred Hyperfine Interaction and Spin-Lattice Relaxation Time in a CsCuCl3 Single Crystal

Abstract

Magnetic susceptibility and paramagnetic shift for central transition of 133 Cs NMR in the single crystal CsCuCl 3 which has transition temperature T N =10.5 K have been measured in the temperature range of 4.2–300 K. From experimental result, we have obtained the transferred hyperfine interaction due to the transfer of spin density from the Cu 2+ ion to the Cs + ion in CsCuCl 3 single crystal. The transferred hyperfine interaction can be expressed by the linear equation H hf =[3.54 T+2.84] (Oe) in the temperature range of 50–300 K; the H hf increases with increasing temperature. 133 Cs spin-lattice relaxation time of 133 Cs NMR in the CsCuCl 3 single crystal was also measured in the same temperature range. The temperature dependence of 1/ T 1 is nearly constant in the paramagnetic phase, while relaxation rate near T N exhibits remarkable change, indicating a drastic alternation of spin dynamics at the Neel temperature.