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Low-Temperature Quantum Relaxation in a System of Magnetic Nanomolecules | | Nikolai Prokof’ev
; Philip Stamp
; | | Date: |
23 Oct 1997 | | Subject: | cond-mat | | Affiliation: | Kurchatov Institute) and Philip Stamp (University of British Columbia | | Abstract: | We argue that to explain recent resonant tunneling experiments on crystals of Mn$_{12}$ and Fe$_8$, particularly in the low-T limit, one must invoke dynamic nuclear spin and dipolar interactions. We show the low-$T$, short-time relaxation will then have a $sqrt{t/ au}$ form, where $ au $ depends on the nuclear $T_2$, on the tunneling matrix element $Delta_{10}$ between the two lowest levels, and on the initial distribution of internal fields in the sample, which depends very strongly on sample shape. The results are directly applicable to the $Fe_8$ system. We also give some results for the long-time relaxation. | | Source: | arXiv, cond-mat/9710246 | | Services: | Forum | Review | PDF | Favorites | |
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