First- and Second-Order Transitions between Quantum and Classical Regimes for the Escape Rate of a Spin System

Details First- and Second-Order Transitions between Quantum and Classical Regimes for the Escape Rate of a Spin System First- and Second-Order Transitions between Quantum and Classical Regimes for the Escape Rate of a Spin System

1998-05-05

arxiv.org/abs/cond-mat/9805060v1

Phys. Rev. Lett. 79, 4469 (1997)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.79.4469

We have found a novel feature of the bistable large-spin model described by the Hamiltonian H = -DS_z^2 - H_xS_x.The crossover from thermal to quantum regime for the escape rate can be either first (H_x

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