Abstract
In order to clarify the spin structure of mixed antiferromagnets Co 1- x Ni x Cl 2 ·6H 2 O, proton NMR spectra are observed in an applied magnetic field along the b axis perpendicular to each easy axis. The resonance fields shift gradually from their positions in CoCl 2 ·6H 2 O to those in NiCl 2 ·6H 2 O upon increasing Ni concentration, x. From analyzing the Ni concentration dependence of these resonance fields, it is shown that the spin directions of these mixtures vary smoothly from the c axis (the easy axis of CoCl 2 ·6H 2 O) to the a ′′ axis (the easy axis of NiCl 2 ·6H 2 O) that is in a good agreement with the model proposed by Matsubara et al. It is confirmed that the oblique antiferromagnetic phase does not occur.
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