Quantum Thermoactivation of Nanoscale Magnets

Details Quantum Thermoactivation of Nanoscale Magnets Quantum Thermoactivation of Nanoscale Magnets

1998-05-05

arxiv.org/abs/cond-mat/9805055v1

Phys. Rev. E 55, 2569 (1997)

Physics

Condensed Matter

Statistical Mechanics

4 pages, no figures, rejected from Phys. Rev. Lett

Scientific paper

10.1103/PhysRevE.55.2569

The integral relaxation time describing the thermoactivated escape of a uniaxial quantum spin system interacting with a boson bath is calculated analytically in the whole temperature range. For temperatures T much less than the barrier height \Delta U, the level quantization near the top of the barrier and the strong frequency dependence of the one-boson transition probability can lead to the regularly spaced deep minima of the thermoactivation rate as a function of the magnetic field applied along the z axis.

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