<p>In this study, Bi-2212 superconductor ceramics with Pr doping in the composition of Bi<sub>2</sub>Sr<sub>2</sub>Pr<sub>x</sub>CaCu<sub>2</sub>O<sub>8+δ</sub> (x = 0.0; 0.1; 0.2; 0.3) were synthesized by the sol–gel method. An investigation was conducted to examine the effect of Pr doping on the structural, microstructural, and magnetic properties. X-ray diffraction (XRD) analysis demonstrated that the primary phase of Bi-2212 exhibited a decline in strength with increasing Pr doping, concomitant with the formation of secondary phases, including PrO<sub>2</sub> and Bi-Sr-Ca oxides, within the structural arrangement. Scanning electron microscopy images revealed that the porous and heterogeneous microstructure observed in the undoped sample transformed into a more compact yet phase-separated texture with high Pr doping. Magnetic measurements reveal a distinct magnetic transition from a superconducting state to a paramagnetic state. The undoped sample exhibited a superconducting transition at approximately 85&#xa0;K. It demonstrated a critical current density (<i>J</i><sub><i>c</i></sub>) of 8.7 × 10<sup>4</sup> A/cm<sup>2</sup> at self-field at 10&#xa0;K. Conversely, no superconducting transition was observed in the Pr-doped samples. The results obtained demonstrate that Pr doping disrupts the structural stability of the superconducting phase, promotes paramagnetic behavior through magnetic Pr<sup>3+</sup> ions and secondary phase formation, and ultimately suppresses superconductivity.</p>

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Suppression of superconductivity and emergence of paramagnetism in Pr-doped Bi-2212 ceramics synthesized by the sol–gel method

  • Hasan Ağıl,
  • Hicran Kurt,
  • Hakan Gündoğmuş

摘要

In this study, Bi-2212 superconductor ceramics with Pr doping in the composition of Bi2Sr2PrxCaCu2O8+δ (x = 0.0; 0.1; 0.2; 0.3) were synthesized by the sol–gel method. An investigation was conducted to examine the effect of Pr doping on the structural, microstructural, and magnetic properties. X-ray diffraction (XRD) analysis demonstrated that the primary phase of Bi-2212 exhibited a decline in strength with increasing Pr doping, concomitant with the formation of secondary phases, including PrO2 and Bi-Sr-Ca oxides, within the structural arrangement. Scanning electron microscopy images revealed that the porous and heterogeneous microstructure observed in the undoped sample transformed into a more compact yet phase-separated texture with high Pr doping. Magnetic measurements reveal a distinct magnetic transition from a superconducting state to a paramagnetic state. The undoped sample exhibited a superconducting transition at approximately 85 K. It demonstrated a critical current density (Jc) of 8.7 × 104 A/cm2 at self-field at 10 K. Conversely, no superconducting transition was observed in the Pr-doped samples. The results obtained demonstrate that Pr doping disrupts the structural stability of the superconducting phase, promotes paramagnetic behavior through magnetic Pr3+ ions and secondary phase formation, and ultimately suppresses superconductivity.