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Quantum entanglement in nitrosyl iron complexes

  • Order, Disorder, and Phase Transition in Condensed Systems
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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 T E 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 T E , the entanglement increases monotonically with decreasing temperature and reaches 90–95% in this complex at T = 25 K, when the side effects are still small.

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Authors and Affiliations

  1. Institute for Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    S. M. Aldoshin, E. B. Feldman & M. A. Yurishchev

Authors
  1. S. M. Aldoshin
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  2. E. B. Feldman
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  3. M. A. Yurishchev
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Correspondence to E. B. Feldman.

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Original Russian Text © S.M. Aldoshin, E.B. Feldman, M.A. Yurishchev, 2008, published in Zhurnal Éksperimental’noĭi Teoreticheskoĭ Fiziki, 2008, Vol. 134, No. 5, pp. 940–948.

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Aldoshin, S.M., Feldman, E.B. & Yurishchev, M.A. Quantum entanglement in nitrosyl iron complexes. J. Exp. Theor. Phys. 107, 804–811 (2008). https://doi.org/10.1134/S1063776108110101

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