Issue |
Europhys. Lett.
Volume 52, Number 6, December II 2000
|
|
---|---|---|
Page(s) | 681 - 687 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2000-00110-7 | |
Published online | 01 September 2002 |
Escape-rate crossover between quantum and classical regimes in molecular magnets: A diagonalization approach
1
Department of Physics, Sejong University - Seoul 143-747, Republic
of Korea
2
Department of Physics and Astronomy, City University of New York-Lehman
College Bedford Park Boulevard West, Bronx, New York, NY 10468-1589, USA
Received:
23
May
2000
Accepted:
18
October
2000
We have studied numerically the quantum-classical crossover in the escape rate for a uniaxial spin system with an arbitrarily directed field. Using the simple quantum transition state theory, we have obtained the boundary separating the first- and the second-order crossover and the escape rate in the presence of the transverse and longitudinal field. The results apply to the molecular nanomagnet, .
PACS: 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.50.Xx – Molecular magnets
© EDP Sciences, 2000
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