Abstract
The quantum-classical transition of the escape rate of the spin model is investigated by a perturbative approach with respect to B [D. A. Garanin, J. Phys A 24, L61 (1991)]. The transition is first order for the boundary line going to zero as in the strongly biased limit. The range of the first-order transition is thus larger than for the model studied earlier, where in the strongly biased case The temperature of the quantum-classical transition, behaves linearly in the strongly biased case for both models:
- Received 4 August 1998
DOI:https://doi.org/10.1103/PhysRevB.59.3671
©1999 American Physical Society