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has been cited by the following article:

• TITLE: Investigating Double-Regime Crossover in Y1Ba2Cu3 - xRxO7 - δ Superconductors

  AUTHORS: Mohamed H. Badr, Lubna M. Sharaf El-Deen, Mohamed El-Hofy, Aly A. Haswa

  KEYWORDS: High Tc Superconductivity; Metal-Insulator Transition; Superconductor-Insulator Transition

  JOURNAL NAME: Crystal Structure Theory and Applications, Vol.3 No.1, March 28, 2014

  ABSTRACT: The effect of Pr and Gd doping on the transport properties of Cu-deficient YBCO superconductors has been studied. Two series of Y1Ba2Cu3 - xRxO7 - δ, where R = Pr or Gd, were prepared by the conventional solid-state reaction technique. Resistance measurements showed a suppression of Tc with increasing of Pr- and Gd-contents in addition to a normal-state metal-to-insulator transition. Moreover, a superconductor-to-insulator transition has been observed at ambient pressure for temperatures less than 50 K for Pr with x = 0.3 and for Gd with x > 0.3. The overall complex behaviours of the resistivity data have been preliminary explained in terms of localization of charge carriers, structural disorders, and magnetic ordering of magnetic moments.