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The intragrain pinning in high-$T_c$ superconductor compoundsY$_{1-x}$RE$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-\delta}$ with low concentration of RE(La, Ce, Pr) was investigated. Magnetic and transport measurements reveal thatthe pinning is maximal for the concentration of heterovalent RE such that theaverage distance between the impurity ions in the plane of rare-earth elementsclose to the diameter of Abrikosov vortices in YBCO.

Pinning Enhancement by Heterovalent Substitution in Y$_{1-x}$RE$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-\delta}$