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We report on the observation of self-organized stripe-like structures on theas-grown surface and in the bulk of (Nd,Eu,Gd)Ba$_2$Cu$_3$O$_y$ singlecrystals. The periodicity of the stripes on the surface lies between 500 and800 nm. These are possibly the growth steps of the crystal. Transmissionelectron microscopy investigations revealed stripes of periodicity in the rangeof 20 to 40 nm in the bulk. From electron back scattered diffractioninvestigations, no crystallographic misorientation due to the nanostripes hasbeen found. Scanning tunneling spectroscopic experiments revealednonsuperconducting regions, running along twin directions, which presumablyconstitute strong pinning sites.

Direct observation of nanometer-scale pinning sites in (Nd$_{0.33}$,Eu$_{0.20}$,Gd$_{0.47}$)Ba$_2$Cu$_3$O$_{7-\delta}$ single crystals