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

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

2005-08-26

arxiv.org/abs/cond-mat/0508627v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.95.227202

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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