Abstract
ABSTRACTReflection high-energy electron diffraction (RHEED) oscillations during pulsed laser ablation of YBCO on SrTiO3(100) substrates were measured. We found that the oscillations are modulated by the laser-pulse repetition frequency, due to diffuse scattering by the initially disordered YBCO material. Since the disordered YBCO crystallizes the specular intensity recovers exponentially with time. An estimate of the diffusion length was obtained by measuring RHEED oscillations during deposition on slightly misoriented SrTiO3(100). From the rise time of the RHEED signal and the mean diffusion length a diffusion constant of 1.4*10−2cm2/sec was determined [1].
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