Incoherent Zener tunneling and its application to molecular magnets

Details Incoherent Zener tunneling and its application to molecular magnets Incoherent Zener tunneling and its application to molecular magnets

1999-11-04

arxiv.org/abs/cond-mat/9911065v2

Phys. Rev. B 61, 12200 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 7 EPS figures, REVTeX, minor changes

Scientific paper

10.1103/PhysRevB.61.12200

We generalize the Landau-Zener theory of coherent tunneling transitions by taking thermal relaxation into account. The evaluation of a new generalized master equation containing a dynamic tunneling rate that includes the interaction between the relevant system and its environment leads to an incoherent Zener transition probability with an exponent that is twice as large as the one of the coherent Zener probability in the limit T -> 0. We apply our results to molecular clusters, in particular to recent measurements of the tunneling transition of spins in Fe8 crystals performed by Wernsdorfer and Sessoli [Science 284, 133 (1999)].

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