亚硝基铁配合物中的量子纠缠
Quantum Entanglement in Nitrosyl Iron Complexes
摘要：
最近对双核亚硝酰铁配合物[Fe_2（C_3H_3N_2S）_2（NO）_4]（I）和[Fe_2（SC_3H_5N_2）_2（NO）_4]（II）多晶样品的磁化率测量表明，这些化合物中存在自旋自由度的量子力学纠缠。在温度T_E以下存在纠缠E，我们估计配合物I和II的温度T_E分别为80-90和110-120 K。利用海森堡二聚体的磁化率的纠缠的表达式，我们发现复杂II的纠缠的温度依赖性。在T_E温度下，纠缠度随温度的降低而单调增加，在T=25 K时，纠缠度达到90-95%，此时从属效应仍然很小。
英文摘要：
Recent magnetic susceptibility measurements for polycrystalline samples of binuclear nitrosyl iron complexes [Fe_2(C_3H_3N_2S)_2(NO)_4] (I) and [Fe_2(SC_3H_5N_2)_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 subordinate effects are still small.
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