  Thermal entanglement, magnetic and quadrupole moments properties of the mixed
spin-1/2 and spin-1 Ising-Heisenberg model on a diamond chain are considered.
Magnetization and quadrupole moment plateaus are observed for the
antiferromagnetic couplings. Thermal negativity as a measure of quantum
entanglement of the mixed spin system is calculated. Different behavior for the
negativity is obtained for the various values of Heisenberg dipolar and
quadrupole couplings. The intermediate plateau of the negativity has been
observed at absence of the single-ion anisotropy and quadrupole interaction
term. When dipolar and quadrupole couplings are equal there is a similar
behavior of negativity and quadrupole moment.
