Entanglement temperature in molecular magnets composed of S-spin dimers

Details Entanglement temperature in molecular magnets composed of S-spin dimers Entanglement temperature in molecular magnets composed of S-spin dimers

2009-08-20

arxiv.org/abs/0908.2838v1

EPL 87, 40008 (2009)

Physics

Quantum Physics

accepted for publication in EPL

Scientific paper

10.1209/0295-5075/87/40008

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).

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