Scholarlink

<p>This work investigates the effect of low-level Fe incorporation (x ≤ 0.009) in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−δ</sub>, nominally at the Y site, on the structural and superconducting properties. X-ray diffraction confirms preservation of the orthorhombic phase with subtle changes in lattice parameters, suggesting local distortions and modifications in oxygen ordering. Resistivity measurements reveal a two-stage superconducting transition associated with intragranular pairing and intergranular coherence, consistent with weak-link behavior in polycrystalline samples. A slight maximum in characteristic temperatures is observed at x ≈ 0.2–0.3%, followed by a decrease at higher Fe content. Magnetic measurements show a reduction of the diamagnetic response and irreversibility temperature with doping. The results indicate competition between weakened intergranular coupling and enhanced intragranular vortex pinning induced by Fe-related defects, highlighting a low-doping regime for tuning superconducting performance.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of Fe Substitution at the Y Site in YBa2Cu3O7−δ Superconductor

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月16日

查看全文
  • Juan Camilo Rincón Fajardo,
  • Fernanda Andrea Páez-Reyes,
  • Eliana Marcela Vargas Pineda,
  • David A. Landínez Téllez,
  • Jairo Roa-Rojas

摘要

This work investigates the effect of low-level Fe incorporation (x ≤ 0.009) in YBa2Cu3O7−δ, nominally at the Y site, on the structural and superconducting properties. X-ray diffraction confirms preservation of the orthorhombic phase with subtle changes in lattice parameters, suggesting local distortions and modifications in oxygen ordering. Resistivity measurements reveal a two-stage superconducting transition associated with intragranular pairing and intergranular coherence, consistent with weak-link behavior in polycrystalline samples. A slight maximum in characteristic temperatures is observed at x ≈ 0.2–0.3%, followed by a decrease at higher Fe content. Magnetic measurements show a reduction of the diamagnetic response and irreversibility temperature with doping. The results indicate competition between weakened intergranular coupling and enhanced intragranular vortex pinning induced by Fe-related defects, highlighting a low-doping regime for tuning superconducting performance.