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Spin coherent-state path integrals and the instanton calculus

Spin coherent-state path integrals and the instanton calculus We use an instanton approximation to the continuous-time spin coherent-state path integral to obtain the tunnel splitting of classically degenerate ground states. We show that provided the fluctuation determinant is carefully evaluated, the path integral expression is accurate to order O (1/ j ). O ( 1 / j ) . We apply the method to the LMG model and to the molecular magnet Fe 8 Fe 8 in a transverse field. © 2003 American Institute of Physics. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Mathematical Physics American Institute of Physics
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