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75As NMR spin-lattice relaxation (1/T1) and spin-echo decay (1/T2) ratemeasurements were performed in a single crystal of Ba(Fe0.93Rh0.07)2As2superconductor. Below the superconducting transition temperature Tc, when themagnetic field H is applied along the c axes, a peak in both relaxation ratesis observed. Remarkably that peak is suppressed for H || ab. Those maxima in1/T1 and 1/T2 have been ascribed to the flux lines lattice motions and thecorresponding correlation times and pinning energy barriers have been derivedon the basis of an heuristic model. Further information on the flux linesmotion was derived from the narrowing of 75As NMR linewidth below Tc and foundto be consistent with that obtained from 1/T2 measurements. All theexperimental results are described in the framework of thermally activatedvortices motions.

NMR investigation of vortex dynamics in Ba(Fe0.93Rh0.07)2As2 superconductor