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The entanglement between spin-1/2 interstitial Heisenberg dimers in the mixedspin-(1,1/2) Ising-XXZ double sawtooth ladder is investigated at lowtemperature. Here, we consider a cyclic four-spin exchange interaction insquare plaquette of each block, and investigate the effects of this amazinginteraction on the bipartite entanglement between spin-1/2 interstitial dimers.Interestingly, we observe a remarkable difference in concurrence behavior withrespect to the cyclic four-spin exchange interaction and magnetic field. Also,the critical points at which the concurrence vanishes are changed versusalteration of the anisotropic parameter of the interstitial Heisenberg dimers.

Thermal entanglement in the mixed-spin Ising-Heisenberg double sawtooth frustrated ladder