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Long-range ferromagnetism of Mn12 acetate single-molecule magnets under a transverse magnetic field

F. Luis·J. Campo·J. Gomez·G. J. McIntyre·J. Luzon·D. Ruiz-Molina
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Abstract

We use neutron diffraction to probe the magnetization components of a crystal of Mn12 single-molecule magnets. Each of these molecules behaves, at low temperatures, as a nanomagnet with spin S = 10 and strong anisotropy along the crystallographic c axis. Application of a magnetic field perpendicular to c induces quantum tunneling between opposite spin orientations, enabling the spins to attain thermal equilibrium. Below approximately 0.9 K, intermolecular interactions turn this equilibrium state into a ferromagnetically ordered phase. However, long range ferromagnetic correlations nearly disappear for fields larger 5.5 T, possibly suggesting the existence of a quantum critical point.

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F. Luis, J. Campo, J. Gomez, G. J. McIntyre, J. Luzon, D. Ruiz-Molina. 2005-08-26. Long-range ferromagnetism of Mn12 acetate single-molecule magnets under a transverse magnetic field. https://doi.org/10.1103/physrevlett.95.227202

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