NMR Study of Influence of the Defects to the Magnetic Interactions and Ground State of Honeycomb Compound Li3M2SbO6 (where M is Cu and Ni)тезисы доклада
Дата последнего поиска статьи во внешних источниках: 29 мая 2019 г.
Аннотация:A new generation of layered antimonite A3M2SbO6 (where A = Li, Na and M
is transition metal) with honeycomb structure is in the focus of the attention of
the investigation during last years. In these compounds ordered mixed-layers of
magnetic cations M2+ and Sb6+ alternate with non-magnetic alkali metal layers.
The crystal structures are very soft and even slight modification results in drastic
changes in the magnetic properties. The non-stoichiometry and the non-magnetic
defects in such systems are very important factors that allow adjusting their
magnetic and electrical characteristics. Here we present the results of NMR study
of Li3M2SbO6 (where M is Cu and Ni) in presents of non-stoichiometry. We
show that the lithium deficiency and the site inversion in these compounds lead
to the transformation of interactions in a two-dimensional hexagonal lattice and
change the ground state. Moreover, the appearance of vacancies at the position
of lithium increases its mobility, which can be detected by NMR-relaxometry
even in such a magnetically concentrated compound.