Physics – Condensed Matter
Scientific paper
2001-11-08
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.
Garg Anupam
Kochetov Evgueny
Park Kwan-Suk
Stone Michael
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