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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…
Application of the discrete Wentzel-Kramers-Brillouin method to spin tunneling
Anupam Garg
A discrete version of the WKB method is developed and applied to calculate the tunnel splittings between classically degenerate states of spin Hamiltonians. The results for particu…
Oscillatory Tunnel Splittings in Spin Systems: A Discrete Wentzel-Kramers-Brillouin Approach
Anupam Garg
Certain spin Hamiltonians that give rise to tunnel splittings that are viewed in terms of interfering instanton trajectories, are restudied using a discrete WKB method, that is mor…
Large transverse field tunnel splittings in the Fe_8 spin Hamiltonian
Anupam Garg
The spin Hamiltonian that describes the molecular magnet Fe has biaxial symmetry with mutually perpendicular easy, medium, and hard magnetic axes. Previous calculations of the…