Investigating Double-Regime Crossover in Y<sub>1</sub>Ba<sub>2</sub>Cu<sub>3 - x</sub>R<sub>x</sub>O<sub>7 - δ</sub>Superconductors

• 作者: Aly A. Haswa Lubna M. Sharaf El-Deen Mohamed El-Hofy Mohamed H. Badr
• 来源期刊: 晶体结构理论与应用(英文)
• 学科: 医学
• 关键词: High Tc Superconductivity METAL-INSULATOR TRANSITION Superconductor-Insulator TRANSITION
• 年，卷（期）: 2014,（1）
• 页码范围: 30-37
• 页数: 8页
• 分类号: R73

摘要

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.