自旋团簇材料中的量子不和谐
Quantum discord in spin-cluster materials
摘要：
海森堡二聚体的总量子关联（不和谐）可以通过自旋-自旋关联函数、内能、比热或磁化率来表示。这使得人们可以通过中子散射，以及量热或磁力实验来间接测量这种不和谐。利用现有的实验数据，我们发现了一些双核海森堡物质与反铁磁和铁磁相互作用的不和谐。对于二聚反铁磁体硝酸铜Cu（NO_3）_2·2.5H_2O，上述三种独立的实验方法在4K下导致约0.2- 0.3bit/dimer的不协调。我们还测定了水合和无水醋酸铜以及铁磁性双核醋酸铜配合物[Cu_2L（OAc）]·6H_2O（L为配体）的不和谐温度行为。
英文摘要：
The total quantum correlation (discord) in Heisenberg dimers is expressed via the spin-spin correlation function, internal energy, specific heat or magnetic susceptibility. This allows one to indirectly measure the discord through neutron scattering, as well as calorimetric or magnetometric experiments. Using the available experimental data, we found the discord for a number of binuclear Heisenberg substances with both antiferro- and ferromagnetic interactions. For the dimerized antiferromagnet copper nitrate Cu(NO_3)_2*2.5H_2O, the three independent experimental methods named above lead to a discord of approximately 0.2-0.3 bit/dimer at a temperature of 4 K. We also determined the temperature behavior of discord for hydrated and anhydrous copper acetates, as well as for the ferromagnetic binuclear copper acetate complex [Cu_2L(OAc)]*6H_2O, where L is a ligand.
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