Title: Quantum Oscillations of the Total Spin in Heterometallic AF Rings - Evidence from Neutron Spectroscopy
Authors: CARRETTA S.SANTINI P.AMORETTI G.GUIDI T.COPLEY J.r.d.QUI Y.CACIUFFO ROBERTOTIMCO G.WINPENNY R.e.p.
Citation: PHYSICAL REVIEW LETTERS vol. 98 no. 16 p. 167401
Publisher: AMERICAN PHYSICAL SOC
Publication Year: 2007
JRC N°: JRC37151
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC37151
Type: Articles in Journals
Abstract: Using inelastic neutron scattering and applied fields up to 11.4 T, we have studied the spin dynamics of the Cr7Ni antiferromagnetic ring in the energy window 0.05 - 1.6 meV. We demonstrate that the external magnetic field induces an avoided crossing (anticrossing) between energy levels with different total-spin quantum numbers. This corresponds to quantum oscillations of the total spin of each molecule. The inelastic character of the observed excitation and the field dependence of its linewidth indicate that molecular spins oscillate coherently for a significant number of cycles. Precise signatures of the anticrossing are also found at higher energy, where measured and calculated spectra match very well.
JRC Institute:Institute for Transuranium Elements

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