Entanglement, magnetic and quadrupole moments properties of the mixed   spin Ising-Heisenberg diamond chain
  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. 
V.S. Abgaryan, N.S. Ananikian, L.N. Ananikyan, V. Hovhannisyan
cond-mat.str-el cond-mat.other