Abstract
The present work investigates the effect of Sm and Co substitution in Bi 2Sr 2Ca 1Cu 2O 8+ δ system. The substitution of Sm leads to an initial increase of transition temperature followed by a decrease. No such increase of transition temperature is observed in Sm and Co co-substituted samples, thus reflecting localization of excess holes in these samples. The suppression of superconductivity in both kind of samples occurs due to hole filling and disorder effects. The insulating state of the samples is described by 3D variable range hopping of conduction mechanism with energy dependent density of states.
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