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cond-mat2001
Spin Coherent-State Path Integrals and the Instanton Calculus
Anupam Garg, Evgueny Kochetov, Kee-Su Park +1
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 prov…
cond-mat2000
Diabolical Points in Molecular Magnets with a Four-Fold Easy Axis
Chang-Soo Park, Anupam Garg
We study the points of degeneracy (diabolical points) in magnetic molecules such as Mn_{12}-acetate that have an easy axis of four-fold symmetry. This is done for general magnetic…
cond-mat1999
Coherent Magnetic Moment Reversal in Small Particles with Nuclear Spins
Anupam Garg
A discrete WKB method is developed for calculating tunnel splittings in spin problems. The method is then applied to the issue of how nuclear spins affect the macroscopic quantum c…