Superconductivity in Pr- and Ce-doped Bi2CaSr2Cu2Oy systems.
作者： V. P. S. Awana , S. K. Agarwal , A. V. Narlikar , M. P. Das
关键词: Superconductivity 、 Doping 、 Inorganic compound 、 Electron localization function 、 Metal–insulator transition 、 Solid solution 、 Physics 、 Lattice (order) 、 High-temperature superconductivity 、 Crystallography
摘要: We report here a systematic study of Pr and Ce doping (at the Ca site) in ${\mathrm{Bi}}_{2}$${\mathrm{CaSr}}_{2}$${\mathrm{Cu}}_{2}$${\mathrm{O}}_{\mathit{y}}$. For both substitutions ${\mathit{T}}_{\mathit{c}}$ decreases with dopant concentration. Results are interpreted terms hole filling due to aliovalent substitution system. At higher level metal-insulator transition, is observed. Near transition localization length (${\mathrm{\ensuremath{\alpha}}}^{\mathrm{\ensuremath{-}}1}$) calculated possibility having local pairs insulating phase invoked. Around region dimensional changeover from two three dimensions observed variable-range hopping (VRH) regime its consequence on superconductivity discussed. The lattice parameters have been estimated through x-ray diffractometry existing more than 3+ oxidation state system inferred. also compared data other rare-earth dopings same
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