Phys. Rev. Lett. 84, 3454–3457 (2000)Butterfly Hysteresis Loop and Dissipative Spin Reversal in the S = 1/2, V15 Molecular ComplexReceived 19 April 1999; published in the issue dated 10 April 2000 Time resolved magnetization measurements have been performed on a spin 1/2 molecular complex, so-called V15. Despite the absence of a barrier, magnetic hysteresis is observed over a time scale of several seconds. A detailed analysis in terms of a dissipative two-level model is given, in which fluctuations and splittings are of the same energy. Spin-phonon coupling leads to long relaxation times and to a particular “butterfly” hysteresis loop. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.3454
DOI:
10.1103/PhysRevLett.84.3454
PACS:
75.50.Xx, 71.70.-d, 75.45.+j
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