Entanglement temperature in molecular magnets composed of S-spin dimers

Abstract

In the present work, we investigate the quantum thermal entanglement in molecular magnets composed of dimers of spin $S$, using an Entanglement Witness built from measurements of magnetic susceptibility. An entanglement temperature, $T_e$, is then obtained for some values of spin $S$. From this, it is shown that $T_e$ is proportional to the intradimer exchange interaction $J$ and that entanglement appears only for antiferromagnetic coupling. The results are compared to experiments carried on three isostructural materials: KNaMSi${}_4$O${}_{10}$ (M$=$Mn, Fe or Cu).

accepted for publication in EPL

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