2001/11/08 by Anupam Garg, Garg, Anupam, Evgueny Kochetov +5
Materials Science · Physics and Astronomy · #Advanced Chemical Physics Studies #Magnetism in coordination complexes #Quantum and electron transport phenomena #cond-mat #quant-ph
paper · pdf · doi:10.48550/arxiv.cond-mat/0111139
32 Pages, RevTex. No figures
arxiv created 2001/11/08 · arxiv updated 2009/11/30
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 Fe8 in a transverse field.