Butterfly Hysteresis Loop and Dissipative Spin Reversal in the S 5 1 2, V 15 Molecular Complex

I. Chiorescu (1) , W. Wernsdorfer (2) , A. Müller (3) , H Bögge , B. Barbara (2)

1 NHMFL - National High Magnetic Field Laboratory
2 LLN - Laboratoire Louis Néel
3 OncoRay - National Center for Radiation Research in Oncology

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.

Domaines: Matière Condensée [cond-mat]; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

I. Chiorescu, W. Wernsdorfer, A. Müller, H Bögge, B. Barbara. Butterfly Hysteresis Loop and Dissipative Spin Reversal in the S 5 1 2, V 15 Molecular Complex. Physical Review Letters, 2000, 84 (15), pp.3454. ⟨hal-01659961⟩