Pressure dependence of the exchange interaction in the dimeric   single-molecule magnet [Mn4O3Cl4(O2CEt)3(py)3]2 from inelastic neutron   scattering
  The low-lying magnetic excitations in the dimer of single-molecule magnets (Mn4)2 are studied by inelastic neutron scattering as a function of hydrostatic pressure. The anisotropy parameters D and B04, which describe each Mn4 subunit, are essentially pressure independent, while the antiferromagnetic exchange coupling J between the two Mn4 subunits strongly depends on pressure, with an increase of 42% at 17 kbar. Additional pressure dependent powder X-ray measurements allow a structural interpretation of the findings. 
A. Sieber, D. Foguet-Albiol, O. Waldmann, S. T. Ochsenbein, G. Carver,   H. Mutka, F. Fernandez-Alonso, M. Mezouar, H. P. We...