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We report on an extended fluctuation regime in the spin dimer system Sr3Cr2O8based on anomalies in Raman active phonons and magnetic scattering. Thecompound has two characteristic temperatures, TS = 275 K, related to aJahn-Teller transition with structural distortions and orbital ordering and asecond, T*= 150 K, which is due to further changes in the orbital sector. BelowTS quasielastic scattering marks strong fluctuations and in addition phononanomalies are observed. For temperatures below T* we observe an exponentialdecrease of one phonon linewidth and determine a gap of the orbitalexcitations. At low temperatures the observation of two- and three-magnonscattering allows the determination of the spin excitation gap.

Coupled spin-lattice fluctuations in a compound with orbital degrees of freedom: the Cr based dimer system Sr3Cr2O8