Martins Ferreira, E.H.; Nemes, M.C. - In: Physica A: Statistical Mechanics and its Applications 310 (2002) 3, pp. 435-449
We derive the tunneling rate for paramagnetic molecules in the context of a collective spin model. By means of path integral methods, an analytical expression is derived. Given the very large spins in question (s∼3000ℏ), the observation of magnetization changes due to pure unitary tunnel...