Tunnel splitting and quantum phase interference in biaxial ferrimagnetic particles at excited states

@article{Nie2001TunnelSA,
  title={Tunnel splitting and quantum phase interference in biaxial ferrimagnetic particles at excited states},
  author={Yihang Nie and Yan-Hong Jin and J.-Q. Liang and Fu‐cho Pu},
  journal={Physical Review B},
  year={2001},
  volume={64},
  pages={134417}
}
The tunneling splitting in biaxial ferrimagnetic particles at excited states with an explicit calculation of the prefactor of exponent is obtained in terms of periodic instantons that are responsible for tunneling at excited states and is shown as a function of magnetic field applied along an arbitrary direction in the plane of hard and medium axes. Using complex time path integral we demonstrate the oscillation of tunnel splitting with respect to the magnitude and the direction of the magnetic… 
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