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Effect of Yb, Gd, and Nd Substitution at the Sr Site on the Metal–Insulator Transition of the (Bi,Pb)‐2212 System
Author(s) -
Biju Alikunju,
Shabna Razia,
Sarun Pallian Murikoli,
Vinu Surendran,
Syamaprasad Upendran
Publication year - 2010
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2009.02356.x
Subject(s) - electrical resistivity and conductivity , materials science , metal , doping , metal–insulator transition , analytical chemistry (journal) , rare earth , strontium , transition temperature , atmospheric temperature range , alkaline earth metal , condensed matter physics , superconductivity , metallurgy , thermodynamics , chemistry , optoelectronics , electrical engineering , physics , organic chemistry , chromatography , engineering
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 Bi 1.7 Pb 0.4 Sr 2 Ca 1.1 Cu 2.1 O y [(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( T min ) 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 T min and the carrier concentration at which MIT occurs depend on the substituted RE.