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molecular nanomagnets; heat capacity; level crossing
Abstract:
The heat capacity of a molecular Cr-8 ring was measured as a function
of temperature and magnetic field in order to follow the evolution of
the Schottky anomaly through the first (S = 0 to \1, - I >) level
crossing occurring at B-c1 = 6.9 T. The results are interpreted within
the framework of a spin Hamiltonian approach and they nicely fit the
pattern of the energy levels derived by inelastic neutron spectroscopy.
At B-c1, the Schottky anomaly almost vanishes suggesting that a true
crossing occurs in Cr-8 in contrast to what was observed for ferric
wheels. (C) 2004 Elsevier B.V. All rights reserved.
