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.
Level crossing in a molecular Cr-8 ring / Affronte, Marco; Guidi, T; Caciuffo, R; Carretta, S; Amoretti, G; Hinderer, J; Sheikin, I; Smith, Aa; Winpenny, Rep; van Slageren, J; Gatteschi, D.. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - STAMPA. - 272:(2004), pp. 1050-1051. [10.1016/j.jmmm.2004.01.033]
Level crossing in a molecular Cr-8 ring
AFFRONTE, Marco;
2004
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.
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