Spin Coherent-State Path Integrals and the Instanton Calculus

Details Spin Coherent-State Path Integrals and the Instanton Calculus Spin Coherent-State Path Integrals and the Instanton Calculus

2001-11-08

arxiv.org/abs/cond-mat/0111139v1

Physics

Condensed Matter

32 Pages, RevTex. No figures

Scientific paper

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). We apply the method to the LMG model and to the molecular magnet Fe_8 in a transverse field.

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