Topological Quenching of Spin Tunneling in Mn_12-acetate Molecules
Mesoscale and Nanoscale Physics
2007-05-23 v1
Abstract
We investigate the topological quenching of spin tunneling in Mn_12-acetate molecules with an applied magnetic field along the hard axis. The model Hamiltonian describing this system has a fourth-order term due to the tetragonal anisotropy. We treat this model using the discrete phase integral formalism in which the Schrodinger equation corresponding to the Hamiltonian becomes a nine-term recursion relation. We solve this recursion relation and find that the tunnel splitting is quenched at certain values of the applied field. We also present a qualitative treatment based on the instanton approach.
Cite
@article{arxiv.cond-mat/0009478,
title = {Topological Quenching of Spin Tunneling in Mn_12-acetate Molecules},
author = {Chang-Soo Park and Anupam Garg},
journal= {arXiv preprint arXiv:cond-mat/0009478},
year = {2007}
}