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We address the problem of spin dynamics in the presence of a thermal bath, bysolving exactly the appropriate quantum master equations withcontinued-fraction methods. The crossover region between the quantum andclassical domains is studied by increasing the spin value S, and the asymptotefor the classical absorption spectra is eventually recovered. Along with therecognized relevance of the coupling strength, we show the critical role playedby the structure of the system-environment interaction in the emergence ofclassical phenomenology.Comment: 4 pp., 3 figs., resubmitted to Phys. Rev. Lett. with minor change

Spin Dynamics in a Dissipative Environment: From Quantal to Classical