Abstract
To study magnetization plateau in NH 4CuCl 3, nuclear magnetic resonance (NMR) experiments were performed under several magnetic fields which correspond to the region below, on, and above the first plateau. From the result of temperature dependence of 15 N -NMR spectra and spin-lattice relaxation rate T 1 −1 around 3 and 6 T , it is proposed that magnetic moments are induced on one Cu-dimer site per every four dimers along crystallographic a-axis at low temperature. This magnetic structure seems to remain up to about 8.5 K and then change to other structures with increasing temperature. It is also revealed that there exists 3D antiferromagnetic ordering below and above the first plateau region at low temperature. These results indicate that this system shows several magnetic structures depending on the external field and the temperature.
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