EPR spectrum via entangled states for an exchange-coupled dimer of single-molecule magnets

Multi-high-frequency electron paramagnetic resonance(EPR) spectrum for a supermolecular dimer <InlineEquation ID="Equ1"> <EquationSource Format="TEX">$\left[ {\rm Mn}_4\right] _2$</EquationSource> </InlineEquation> of single-molecule magnets recently reported [S. Hill, R.S. Edwards, N. Aliaga-Alcalde and G. Christou (HEAC), Science <Emphasis Type="Bold">302, 1015 (2003)] is studied in terms of the perturbation method in which the high-order corrections to the level splittings of degenerate states are included. It is shown that the corresponding eigenvectors are composed of entangled states of two molecules. The EPR-peak positions are calculated in terms of the eigenstates at various frequencies. From the best fit of theoretical level splittings with the measured values we obtain the anisotropy constant and exchange coupling which are in agreement with the corresponding values of experimental observation. Our study confirms the prediction of HEAC that the two Mn4 units within the dimer are coupled quantum mechanically by the antiferromagnetic exchange interaction and the supermolecular dimer behaviors in analogy with artificially fabricated quantum dots. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005