ИСТИНА

The impact of defects on the balance of interactions in the frustrated layered honeycomb magnets is a topic that has been actively discussed in recent years. Here we present the results of studies of compound Li0.8[Ni0.6Sb0.4]O2 where structural defects are created by the deficient of Li ions, which occupy the positions between the magnetic Ni-Sb-O honeycomb planes. Such defects lead to various changes in the system: first, due to the requirements of the charge balance, one can expect changes in the oxidation state of Ni and Sb ions in planes. Secondly, structural studies favor a small change in the Sb ions content in this compound and the related structural defects of planes and local breaks of the periodicity of the magnetic lattice. Thirdly, one can, in principle, expect the appearance of mobile charge carriers in metal-oxide planes. And finally, fourthly, vacancies at lithium positions lead to hopping mobility of these ions at high temperatures [1]. The data obtained in the studies of AC and DC susceptibility and 7Li NMR indicate that the ground state of the system is transformed from zigzag AF order to cluster spin glass, which, in principle, is expected when defects are introduced into a frustrated magnetic system. Based on the research results, the features of the critical regime and the parameters of the ground state in the system under study are determined.