First- and Second-order Crossover of the Escape Rate for the Biaxial Spin Model with the Field Applied along the Hard Axis at Resonance

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We have studied numerically the quantum-classical crossover of the escape rate in the biaxial spin system with an external field along the hard axis. Using the simple quantum transition state theory, we have obtained the crossover boundary separating the first- and the second-order crossovers and found that the first-order region is greatly suppressed in a moderate spin system, compared with the quasiclassical results. Applying an external longitudinal field, we have presented the peculiar crossover boundaries at resonant fields. The results can apply to a molecular nanomagnet.
Publisher
KOREAN PHYSICAL SOC
Issue Date
2011-07
Language
English
Article Type
Article
Keywords

QUANTUM-CLASSICAL TRANSITION; MAGNETIC-FIELD; SYSTEM; REGIMES

Citation

JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.59, no.1, pp.93 - 97

ISSN
0374-4884
URI
http://hdl.handle.net/10203/95811
Appears in Collection
EE-Journal Papers(저널논문)
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