Abstract
We investigate the influence of praseodymium content on the basis plane conductivity of Y1−хPrхBa2Cu3O7−δ single crystals. An increase of the praseodymium concentration leads to the enhancement of the localization effects and the appearance of a metal–insulator transition in the system, which always precedes the superconducting transition. The increase of the concentration of praseodymium, leads to a significant displacement of the point of the metal–insulator transition in the low temperature region.
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