Abstract
The 9.6 GHz antiferromagnetic and paramagnetic resonance spectrum of LiCuCl 3.2H 2O is studied as a function of temperature for various directions of the external magnetic field. The easy axis, e, is found to be in the a- c plane at an angle of 70.5° to the a axis and 38.5° to the c axis. Four AFMR lines are detected in the case H‖ e below the Néel temperature of 4.4 K. Each of these lines shows the characteristic temperature and angular dependence, as predicted by the theory of Nagamiya, Keffer and Kittel. Three new resonance lines are detected below 2.5 K, these lines are suggested to be the resonances due to the occurrence of a second, two-sublattice system in the compound. The critical line broadening of the paramagnetic resonance line above T N is also noted; various descriptions for this broadening are presented.
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