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Flux dynamics in-Ln(Ba2-xPrx)Cu3O 7+δ (Ln = Tm, Lu)

Mokhtari, Z ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1143/JJAP.45.742
  3. Publisher: 2006
  4. Abstract:
  5. Single-phase Tm(Ba2-xPrx)Cu3O 7+δ and Lu(Ba2-xPrx)Cu3O 7+δ compounds with Pr content 0.0 ≤ x ≤ 1.0 have been prepared by solid-state reaction technique. The oxygen content of our samples is more than 7. X-ray diffraction (XRD) patterns demonstrate an orthorhombic to tetragonal transition with an increase in Pr content in both systems. For each system, a solubility limit exists for substitution of Pr at the Ba site. The intergrain region investigated by the thermally activated flux creep (TAFC) and Ambegaokar-Halperin (AH) models, show that the pinning energy decreases with increasing Pr content; it also decreases in each sample with increasing magnetic field as a power-law relation. The temperature and magnetic field dependences of pinning energy in Lu(BaPr)-123 are less than in Tm(BaPr)-123. The intergrain Jc obtained from I-V curves decreases with increasing Pr content and decreases with increasing magnetic field as a power-law relation. Also, the intragrain Jc obtained from the M-H curves, decreases with increasing magnetic field. In both Tm- and Lu-based samples, intragrain Jc is approximately three orders of magnitude larger than intergrain Jc. © 2006 The Japan Society of Applied Physics
  6. Keywords:
  7. Chemical reactions ; Magnetic fields ; Phase transitions ; Flux dynamics ; Pr doping ; Solid state reactions ; Copper compounds
  8. Source: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers ; Volume 45, Issue 2 A , 2006 , Pages 742-751 ; 00214922 (ISSN)
  9. URL: https://iopscience.iop.org/article/10.1143/JJAP.45.742