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Magnetic transport properties and Hall effect in Gd 1-xPrxBa2Cu3O7-δ system

Khosroabadi, H ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. DOI: 10.1016/S0921-4534(02)01876-2
  3. Publisher: 2003
  4. Abstract:
  5. The XRD and SEM analyses, electrical resistivity, magnetoresistance, and Hall effect measurements have been performed on single phase polycrystalline Gd1-xPrxBa2Cu3O7-δ samples with x = 0.05, 0.10, and 0.15. The electrical resistivity measurements show a reduction of superconducting transition temperature and an increase of superconducting transition width with increasing x. The magnetoresistance measurements show small changes in the normal state, although large in the superconducting state. The superconducting transition width also increases with the magnetic field at least up to 10 kOe, and it shows a scaling relation with the magnetic field for all of the samples. The derived flux-pinning energy, based on the thermally activated flux creep model, decreases with the increase of magnetic field and x. Our results show the exponent behavior of flux-pinning energy as U ∝ H-β, where β is independent of the Pr content. An exponent behavior of flux-pinning energy versus temperature has also been derived. An anomalous sign reversal of the Hall coefficient in the mixed-state of the Gd0.90Pr0.10Ba2Cu3O7-δ sample with respect to temperature is also reported. © 2002 Published by Elsevier Science B.V
  6. Keywords:
  7. Flux-pinning energy ; Gd1-xPrxBa2Cu3O7-δ ; Hall effect ; Magnetoresistance ; Upper critical field
  8. Source: Physica C: Superconductivity and its Applications ; Volume 384, Issue 1-2 , 2003 , Pages 169-177 ; 09214534 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0921453402018762