Entanglement in the linear-chain Heisenberg antiferromagnet Cu(C4H4N2)(NO3)2
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- Batle, J., Farouk, A., Alkhambashi, M. et al. Eur. Phys. J. B (2017) 90: 49. doi:10.1140/epjb/e2017-80004-1
Quantum correlations are generally impossible to address directly in bulk systems. Quantum measures extended only to a few number of parties can be discussed in practice. In the present work we study a cluster of spins belonging to a compound whose structure is that of a quantum magnet. We reproduce at a much smaller scale the experimental outcomes and then we study the role of quantum correlations there. A macroscopic entanglement witness has been introduced in order to reveal quantum correlations at nonzero temperatures. The critical point beyond which entanglement is zero is found at Tc = 15 K.