Volume 47, Number 2, July II 1999
|Page(s)||254 - 259|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Nuclear-spin–driven resonant tunnelling of magnetisation in Mn12 acetate
Laboratoire de Magnetisme Louis Néel - CNRS, BP 166, 38042 Grenoble, France
2 Dipartimento di Chimica, Università di Firenze Via Maragliano 77, 50144 Firenze, Italy
Accepted: 19 May 1999
Current theories still fail to give a satisfactory explanation of the observed quantum phenomena in the relaxation of the magnetisation of the molecular cluster Mn12 acetate. In the very low-temperature regime, Prokof'ev and Stamp recently proposed that slowly changing dipolar fields and rapidly fluctuating hyperfine fields play a major role in the tunnelling process. By means of a faster relaxing minor species of Mn12ac and a new experimental "hole digging” method, we measured the intrinsic linewidth broadening due to local fluctuating fields, and found strong evidence for the influence of nuclear spins on resonance tunnelling at very low temperatures (0.04–0.3 K). At higher temperature (1.5–4 K), we observed a homogeneous linewidth broadening of the resonance transitions being in agreement with a recent calculation of Leuenberger and Loss.
PACS: 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.50.Tt – Fine-particle systems / 75.60.Ej – Magnetisation curves, hysteresis, Barkhausen and related effects
© EDP Sciences, 1999
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