Quantum Entanglement in Nitrosyl Iron Complexes
Abstract
Recent magnetic susceptibility measurements for polycrystalline samples of binuclear nitrosyl iron complexes [Fe2(C3H3N2S)2(NO)4] (I) and [Fe2(SC3H5N2)2(NO)4] (II), suggest that quantum-mechanical entanglement of the spin degrees of freedom exists in these compounds. Entanglement E exists below the temperature TE that we have estimated for complexes I and II to be 80-90 and 110-120 K, respectively. Using an expression of entanglement in terms of magnetic susceptibility for a Heisenberg dimer, we find the temperature dependence of the entanglement for complex II. Having arisen at the temperature TE, the entanglement increases monotonically with decreasing temperature and reaches 90-95% in this complex at T=25 K, when the subordinate effects are still small.
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