TL;DR
This paper demonstrates how quantum discord in spin-cluster materials can be inferred from experimental data such as neutron scattering and calorimetry, providing insights into quantum correlations in magnetic substances.
Contribution
It introduces a method to estimate quantum discord in Heisenberg dimers using experimental measurements, enabling indirect analysis of quantum correlations in real materials.
Findings
Quantum discord in Heisenberg dimers can be derived from measurable physical quantities.
Experimental discord values are approximately 0.2-0.3 bits at 4 K for copper nitrate.
Temperature dependence of discord was characterized for various copper acetate compounds.
Abstract
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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