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

被引：0

作者：

Kang, Doo Hyung ^{[1
,2
]}

Shin, Mincheol ^{[2
]}

Kim, Gwang-Hee ^{[1
]}

机构：

[1] Sejong Univ, Dept Phys, Seoul 143747, South Korea

[2] Korea Adv Inst Sci & Technol, Dept Elect Engn, Taejon 305701, South Korea

来源：

JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2011年 / 59卷 / 01期

关键词：

Molecular magnets; Quantum tunneling of magnetization; QUANTUM-CLASSICAL TRANSITION; REGIMES; SYSTEM;

D O I：

10.3938/jkps.59.93

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：93 / 97

页数：5

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