Quantum entanglement in trimer spin-1/2 Heisenberg chains with antiferromagnetic coupling
Abstract
The quantum entanglement measure is determined, for the first time, for antiferromagnetic trimer spin-1/2 Heisenberg chains. The physical quantity proposed to measure the entanglement is the distance between states by adopting the Hilbert-Schmidt norm. The method is applied to the new magnetic Cu(II) trimer system, 2b.3CuCl2.2H2O, and to the trinuclear Cu(II) halide salt, (3MAP)2Cu2Cl8. The decoherence temperature, above which the entanglement is suppressed, is determined for the both systems. A correlation among their decoherence temperatures and their respective exchange coupling constants is established.
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