Quantum Hole Digging in Magnetic Molecular Clusters

Details Quantum Hole Digging in Magnetic Molecular Clusters Quantum Hole Digging in Magnetic Molecular Clusters

1999-12-07

arxiv.org/abs/cond-mat/9912106v1

Physica B: Condensed Matter, 284-288 (2000) pp. 1229-1230

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 2 figures, conference proceedings of LT22 (Helsinki, Finland, August 4-11, 1999)

Scientific paper

10.1016/S0921-4526(99)02480-1

Below 360 mK, Fe8 magnetic molecular clusters are in the pure quantum relaxation regime. We showed recently that the predicted ``square-root time'' relaxation is obeyed, allowing us to develop a new method for watching the evolution of the distribution of molecular spin states in the sample. We measured the distribution P(H) of molecules which are in resonance at the applied field H. Tunnelling initially causes rapid transitions of molecules, thereby ``digging a hole'' in P(H). For small initial magnetisation values, the hole width shows an intrinsic broadening which may be due to nuclear spins. We present here hole digging measurements in the thermal activated regime which may allow to study the effect of spin-phonon coupling.

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