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We analyze the effects of the environment on the spin tunneling process ofparamagnetic and superparamagnetic particles and conclude that the non assistedmacroscopic tunneling rate is hardly affected in such case, but other moreeffective (phonon mediated) processes change the magnetization state of theparticle. We conclude that for both, paramagnetic and superparamagneticparticles, the decoherence time scale is extremely short (~ 10^(-8..-16)seg),indicating thar coherent tunneling should be strongly suppressed in favor ofincoherent tunneling, i.e., the population of higher levels with subsequentdecay.

Decoherence Effects on the Tunneling Rate of Paramagnetic and Superparamagnetic Particles