Resonant quantum coherence of magnetization at excited states in nanospin systems with different crystal symmetries

Details Resonant quantum coherence of magnetization at excited states in nanospin systems with different crystal symmetries Resonant quantum coherence of magnetization at excited states in nanospin systems with different crystal symmetries

1999-12-14

arxiv.org/abs/cond-mat/9912231v2

Eur. Phys. J. B 16, 507-513 (2000)

Physics

Condensed Matter

Statistical Mechanics

23 pages, final version and accepted by Eur. Phys. J. B

Scientific paper

The quantum interference effects induced by the Wess-Zumino term, or Berry phase are studied theoretically in resonant quantum coherence of magnetization vector between degenerate excited states in nanometer-scale single-domain ferromagnets in the absence of an external magnetic field. By applying the periodic instanton method in the spin-coherent-state path integral, we evaluate the low-lying tunnel splittings between degenerate excited states of neighboring wells. And the low-lying energy level spectrum of m-th excited states are obtained with the help of the Bloch theorem in one-dimensional periodic potential.

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