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In this work we investigate the conductivity in the base plane of YBa2Cu3O7 (YBCO) single crystals with slight (up to 5%) aluminium (Al) and praseodymium (Pr) doping and with a given topology of plane defects. The results indicate that the doping with Al and Pr results to the increase of the number of the effective scattering centers of the normal carriers. The excess conductivity for the analyzed...
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