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We perform fracture experiments on nanoscale phase separated glasses andmeasure crack surface roughness by atomic force microscopy. The ability oftuning the phase domain size by thermal treatment allows us to test thoroughlythe predictions of crack font depinning models about the scaling properties ofcrack surface roughness. It appears that in the range of validity of thesedepinning models developed for the fracture of brittle materials, ourexperimental results show a quantitative agreement with theoreticalpredictions: beyond the characteristic size of disorder, the roughness of cracksurfaces obeys the logarithmic scaling early predicted by Ramanathan, Ertas andFisher (PRL97)

Crack propagation through phase separated glasses: effect of the characteristic size of disorder