  We demonstrate that inelastic neutron scattering technique can be used to
indirectly detect and measure the macroscopic quantum correlations quantified
by both entanglement and discord in a quantum magnetic material, VODPO4 . 1D2O.
The amount of quantum correlations is obtained 2 by analyzing the neutron
scattering data of magnetic excitations in isolated V4+ spin dimers. Our
quantitative analysis shows that the critical temperature of this material can
reach as high as Tc = 82.5 K, where quantum entanglement drops to zero.
Significantly, quantum discord can even survive at Tc = 300 K and may be used
in room temperature quantum devices. Taking into account the spin-orbit (SO)
coupling, we also predict theoretically that entanglement can be significantly
enhanced and the critical temperature Tc increases with the strength of
spin-orbit coupling.
