Investigating Double-Regime Crossover in Y 1 Ba 2 Cu 3 - x R x O 7 - δ Superconductors
作者： Mohamed H. Badr , Lubna M. Sharaf El-Deen , Mohamed El-Hofy , Aly A. Haswa
关键词: Doping 、 Metal–insulator transition 、 Ambient pressure 、 Superconductor Insulator Transition 、 Charge carrier 、 Magnetic moment 、 Condensed matter physics 、 Superconductivity 、 Materials science 、 Electrical resistivity and conductivity 、 Analytical chemistry
摘要: The effect of Pr and Gd doping on the transport properties of Cu-deficient YBCO superconductors has been studied. Two series Y1Ba2Cu3 - xRxO7 δ, where R = or Gd, were prepared by conventional solid-state reaction technique. Resistance measurements showed a suppression Tc with increasing Pr- Gd-contents in addition to normal-state metal-to-insulator transition. Moreover, superconductor-to-insulator transition observed at ambient pressure for temperatures less than 50 K with x 0.3 > 0.3. overall complex behaviours resistivity data have preliminary explained terms of localization charge carriers, structural disorders, magnetic ordering of magnetic moments.
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