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Substitution of Nd at Ba site in Gd123

Mirzadeh, M ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1002/pssb.200541372
  3. Publisher: 2006
  4. Abstract:
  5. Structural and superconducting behaviors of Gd(Ba2-xNd x)Cu3O7-δ with 0.0 ≤ x ≤ 0.8 have been studied by X-ray diffraction and electrical and magnetic measurements. The XRD patterns show the samples with x ≤ 0.5 are isostructure 123 phase, and an orthorhombic-tetragonal phase transition occurs at x = 0.2. The transition temperature decreases linearly with increasing Nd content. This behavior is also observed in the curves of the room-temperature resistivity versus Nd doping. The metal-insulator and superconductor-insulator transitions occur at x cMIT = 0.3 and x0SIT = 0.35, respectively. The conduction mechanisms of the normal-state resistivity are the Coulomb gap (CG) for x < xcMIT , two-dimensional variable-range hopping (2D-VRH) at xcMIT ≤ x ≤ xSIT, and 3D-VRH for xcMIT ≤ x cSIT . The pinning energy derived from the thermally activated flux creep model, and coupling energy derived from the Ambegaokar-Halperin theory decrease with increasing applied magnetic field as a power-law relation, and decrease as Nd content increases. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA
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  8. Source: Physica Status Solidi (B) Basic Research ; Volume 243, Issue 12 , 2006 , Pages 2819-2829 ; 03701972 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/10.1002/pssb.200541372