Observation of Magnetic Level Repulsion in Fe6:Li Molecular Antiferromagnetic 
Rings

Affronte, M.; Cornia, A.; Lascialfari, A.; Borsa, F.; Gatteschi, D.; Hinderer, J.; Horvatić, M.; Jansen, A. G. M.; Julien, M.-H.

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Observation of Magnetic Level Repulsion in Fe6:Li Molecular Antiferromagnetic Rings

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Hinderer, J.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Horvatić, M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Jansen, A. G. M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Affronte, M., Cornia, A., Lascialfari, A., Borsa, F., Gatteschi, D., Hinderer, J., et al. (2002). Observation of Magnetic Level Repulsion in Fe6:Li Molecular Antiferromagnetic Rings. Physical Review Letters, 88(16): 167201.

Cite as: https://hdl.handle.net/21.11116/0000-000E-EE4D-1

Abstract

Heat capacity (C), magnetic torque, and proton NMR relaxation
rate (1/T-1) measurements were performed on Fe6:Li single
crystals in order to study the crossings between S = 0 and S =
1 and between S = 1 and S = 2 magnetic states of the molecular
rings, at magnetic fields B-c1 = 11.7 T and B-c2 = 22.4 T,
respectively. C vs B data at 0.78 K show that the energy gap
between two states remains finite at B-c 's (Delta(1)/k(B) =
0.86 K and Delta(2)/k(B) = 2.36 K) thus proving that levels
repel each other. The large Delta(1) value may also explain the
anomalously large width of the peak in 1/T-1 vs B, around B-c1.
This anticrossing, unexpected in a centrosymmetric system,
requires a revision of the Hamiltonian.