Abstract
Resistivity measurements in the temperature range (64–300 K) were used to study the metal–insulator transition (MIT) driven by a change in the carrier concentration of the Bi1.7Pb0.4Sr2Ca1.1Cu2.1Oy [(Bi,Pb)‐2212] system. The carrier‐concentration is changed by substituting rare‐earth (RE) elements (Nd, Gd, and Yb) at the Sr site of (Bi,Pb)‐2212. Results show that at higher levels of RE substitution, MIT occurs in (Bi,Pb)‐2212, during which the resistivity becomes minimum at a particular temperature(Tmin) for a particular doping level. Below this temperature, resistivity increases with a decrease in the temperature and vice versa, showing an insulating and a metallic nature, respectively. This Tmin and the carrier concentration at which MIT occurs depend on the substituted RE.
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