Аннотация:As it was shown by magnetometry and ESR measurements a new family of
A2MnTeO6 (A = Li, Na) demonstrates a nontrivial effect of hidden magnetic
order. It’s static and dynamic magnetic properties indicate a strong frustration
on the triangular lattice and a two-dimensional character of magnetism. Our
NMR studies make it possible to clarify the picture of the establishment of the
magnetic order for different values of the external magnetic field. The data on
nuclear magnetic relaxation and transformation of the shape of the spectrum
prove a presence of the magnetic order, even in small external fields, where the
static magnetometry data does not demonstrate any features on the temperature
dependence of the magnetic susceptibility.