Escape-rate crossover between quantum and classical regimes in molecular magnets: A diagonalization approach
Department of Physics, Sejong University - Seoul 143-747, Republic
2 Department of Physics and Astronomy, City University of New York-Lehman College Bedford Park Boulevard West, Bronx, New York, NY 10468-1589, USA
Accepted: 18 October 2000
We have studied numerically the quantum-classical crossover in the escape rate for a uniaxial spin system with an arbitrarily directed field. Using the simple quantum transition state theory, we have obtained the boundary separating the first- and the second-order crossover and the escape rate in the presence of the transverse and longitudinal field. The results apply to the molecular nanomagnet, .
PACS: 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.50.Xx – Molecular magnets
© EDP Sciences, 2000